i see that you have a couple softcapped toons...go with claws/sr or fm/sr and you wont regret it haha
Since you're someone who greatly enjoys brutes, I'd recommend you limit your choices to /Inv, /WP and /SD. Brutes get a taunt aura in all of their secondaries, but scrappers get it only in those three. And without a taunt aura, it's a pretty good chance that you'll go nuts when mobs start running away from your AoEs.
I made an elec/sd and sunk ~2bn into it to softcap and run with 24s rech on LR+SC i loved it immensely...then i made a fm/sd and sunk around the same into it...i love it even more - doesnt really die often and the ST DPS is awesome and the AoE is nothing to be sniffed at either
I would also recommend regeneration as its the most engaging set as it requires alot of clicks and being on your toes alot of the time 
maybe try kinetic melee - may not be the 'best' set but looks awesome :P
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I'd start by looking for options that aren't better on Brutes, or that won't be better on Brutes with power proliferation in the next issue. For me, that narrows the list of secondaries down to... Dark Armor & Shield Defense.
If you go Dark Armor, I'd recommend Dark Melee, Katana or Broadsword (in that order) for primary. All three either have a nice defense buff or to-hit debuff that complements Dark Armor's resists nicely. I recommend Dark Melee first mainly due to lack of redraw and the self-heal, but all three are great options. That said, it'd be tough to argue for Broadsword over Katana, except on aesthetics.
If you go Shield Defense, I'd recommend Kinetic Melee. There are other options, even some really good options, but stacked +Dmg buffs really shine on Scrappers.
Thanks to everyone who replied. Very grateful that no one took this as some kind of Scrappers suck post, I know they don't I am just having trouble finding one for me.
@Exxar I think you have hit the naii on the head. I really miss the taunt component in the damage Aura's when I try to play a scrapper. Out of the ones I listed the ELM/Sd was the one I liked the most but the ST damage turned me off.
So I will be trying to push through a FM/SD and a KM/SD and see which takes my fancy better.
Global: @Kelig
First I wanted to stated out front that I'm not attempting to troll the scrapper board here with this post. This is an honest question.
TL : DR Version: What scrapper should I build based on what I have enjoyed in the past?
I would like to be able to get into and enjoy a scrapper. I have no clue what to pick that is going to hold my attention and have the flow in battle that keeps me wanting to keep playing non stop. Some background to help anyone willing to make a suggestion know what I am into.
When I first bought the game and started playing (on the day that ED was introduced to the game. Not a good 1st days experience reading broadcast chat that day) I looked over the Archetypes and the Scrapper seemed by far to me the best fit for how I like to play. I went out and rolled up a BS/Regen scrapper and plugged away at him til CoV launched and then got hooked on Brutes.
Fast forward several years later and my tastes have broadened I have the following 50's that I enjoying playing for hours at a time:
SS/FA/Soul Brute
FM/ELA/Soul/Brute
Em/ELA/Mu Brute
FM/WP/Mu Brute
Crabspider:Tankbuild with perma pets
Banespider:Macebuild high dps, moderate aoe
Nightwidow: Incarnate capped, moderate to high dps, high aoe
Fire/Traps/Scorpion Corr: High dps and Aoe with huge debuffs.
Mind/Fire/Ice dom: Everyone needs the solo tf in your sleep toon
Plant/Fire/Ice: Softcapped, perma dom/hasten.
Plant/Kin/Earth Troller: self pl experiment.
Elec/Fire/Ice Blaster: AOE ball oh death and debt.
I really really want to add a scrapper to that list. It is the one AT left that I want a 50 from that I enjoy to play. Tank/defs/khelds/mm's and stalkers bore me but I should enjoy Scappers and for some reason I have never been able to get one to hold me like my other high level toons have.
Based on what I have like before what would the scions of the Scrapper forums think I would enjoy?
I have tried:
BS/Regen
Elm/SD
Spines/Fire
Claws/Ela
all to the mid 30's and not liked them.
Global: @Kelig