Which booster pack do you like best?

Me, too. It almost hurts my back to watch them run around all hunched over like that.

LEGION OF VALOR - Be a part of the Legend!

If we're counting the GvE and Mac bonuses, get those. They're only 5 dollars if you get their respective editions and the powers are extremely convenient.

All of my characters use Ninja Run from level 4 until I take a travel power, which is often much later than 14 now, and is often complely skippable, since I have the Jump Pack from GvE and I always have a Raptor Pack, so it's fairly easy to get anywhere I need to.

I use the Fortune buff regularly when I'm teamed, and I'll be using the Secondary Mutation pretty much whenever it's up. Any buff is useful, even if it doesn't do much, and the chance to turn into a monkey only bothers me in one way: It's so low, that I've yet to see it happen to myself, or anyone else.

The Pocket D and Mission transporters are nifty, and I use them semifregularly, but I don't think I'd really miss them if I lost them. And Self Destructon? I remove it from my bar as soon as I create a new character. I can't remember the last time I used it. Oh, wait - I used it a couple months ago, right before deleting a character, in front of the noobie I had just dumped 25 million on. The "Holy crap what was that?" just before my logout timer ended was GREAT.

For costume parts, The helmet and mask parts from the Cyborg and Ninja packs, the gloves from the Cyborg pack, the Baron boots and jacket, the robes from the Ninja pack and random parts from the Valkyrie pack get the most use from me. I'd use the Wedding Pack more often, but I don't make female characters often, and I like the female parts of that pack better than the male ones. Same for the Witch parts from the Arcane pack. I'll probably use stuff from the mutant pack a fair amount too, I used to use Bio-Organic on a few characters; I'll probably replace at least some with the new skins.

Toss up between the Wedding pack and the one that gives you the mission transporter.

Oh man! This is a detailful question. Currently I own GvE, Valkyrie, and Magic only. Because I do not have all that much spare cash, you know? Monthly fees are doable, more gets quite iffy (Yay job this weekend so I can preorder GR and maybe get a booster too!)

Most Used Costumes: Valkyrie Pack. Obviously it's one of the three I own, as the ones I have are the ones I felt looked coolest. Both the Valk and GvE packs have excellent costume bits that can easily be combined with other stuff in the game- and that's a big deal to me. I don't wanna be wearing just the whole Witch set, you know? Gotta make something cool out of everything!

The Valk stuff is so sleek and I love how it mixes with even basic tights and with skin options. Justice and Sinister can both look freaking awesome with many options, but I don't use them quite as much. Magic has great stuff too, but it's harder to blend, apart from the AWESOME LONG GLOVES! Gotta find how to use that witch skirt, hrm...

I'm certain I would use the crap out of some of the wedding pack stuff, but it's another "not sure I'd use enough to be worth it" deal. Also, even though I don't make male characters, this would put me in the "way too many damn suits" zone.

Best Powers: We all know the Valk and GvE powers are friggin awesome. And I'd LOVE to get Ninja Run, but I'm not sure I'd use the Martial Arts pack costume bits enough to justify it to myself. They seem a bit bland to me, and while that helps with combining with other sets... there's too much of a good thing. Maybe something will change my mind on that.
I really wish I had self-destruct, but I have basically no desire for anything else in the cyborg pack. A pity.

Emotes!: Oh man. I love juggle magic/fire/lightning, and the card trick followed by 52-pick-up is amazing. The lightning and spin and cast ccE's get frequent use.. and yeah. Magic pack wins by a mile.

Least Appealing: Inevitably, something is in last place. In my case, it's the Science pack. I don't like the look of the lab coats, I find the non-booster goggles better than the booster ones, and I just don't need body-resizing stuff. Yeah, that's disinterest in pretty much every part of the whole pack.

Next Purchase: Honestly I don't know. It's between Martial Arts, Mutant, and Wedding packs. They're all "I want part of this pack, but I'm not sure if I'll get much use out of it / not sure I'll use many things from the pack at all"
I'm waiting to see more good screenshots of using the Mutant or martial stuff in varied costumes. And to see if we get Organic Armor with skin.