Okay so.. I wanna make a controller

The main question is why use SO's, are they still on the market? WOW!!! If so because for one, you will greatly benefit from just Training/Regular IO's (Invention Original Recipes/or crafted enhancements). At level 32, for level 27 even, you want to slot level 35 regular IO's at lvl 32 or level 30 regular IO's for level 27. You can hold on to them without ever having to worry if they are red or not because your toon may have out-level'ed their working limit. You can keep the crafted IO's until the toon reache level 50 and respec build if need be[Quote].

Local Man and quite a few others has giving you some great input on what is the better to start with. After reviewing, Local Man's responses, he is 99.9% accurate. You did mention you are a solo'ist and a team-mate sometimer so, Ill/Rad is your best choice. The only thing about Ill/Rads are ...... they ... are .... so .... great (depending on build), you may not want to play another troller ..... ever ... accept their are other troller builds you can tweak and master according to your controlling playstyle like Plant/Poinson or a Fire/Kin troller. But the The things you can do with an Ill/Rad makes your favorite Tanker and/or balaster (No Offense to Tankers & Blasters) but just saying you may feel what you have persnally on your character tray cannot defeat it. It is the only controller (IMO) that can be Tanker, Blaster and Defender. SO's will just give you a taste but with global bonuses stats, you will be golden especially when you get T4 Incarnates.
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I actually just gave some generic IO's a try, and some sets that I could afford on my Mastermind and so I'm probably going to be using Generic IO's for most of the time on the troller

That strong feeling is wrong. My 3rd toon to 50, was my second controller to 50, an illusion/rad controller. Back in i8 was when I started him. I solo'd the vast majority of the jorney 1-50. I started in Atlas, then Hollows, then faultline, Striga.... etc. My illusion/rad competed with my scrapper, who had been my 1st 50 in speed for grinding 1-50. My second toon to 50 was my fire/rad controller. The tools available to ill/rad helped him to make the 1-50 very fun and good in terms of speed.

My vote would be for illusion/rad if it's your first controller especially if it's with SOs.

I would recommend Mind/ controller if you would like to solo or grind a /kin controller. When I wanted to make a /kin controller, I came to the conclusion back in i8-i9, that Mind/ would be the safest to grind a /kin controller. It is very very busy and it is clicky.

In many cases, sets are so cheap that you may do better using them. For example, in Radiation Infection, the Dark Watcher set is quite cheap and gives you good ToHit Debuff and EndRdx . . . and four of them gives you a small (5%) Recharge bonus.

Another great option is "Frankenslotting." This is where you can pick up some cheap dual or triple attribute IOs from different (and often cheap) sets and combine them for better enhancment. An Acc/Dam from two different sets at the same level is better than a common Accuracy and a common Damage . . . and they actually can be cheaper. Figure out what each power needs, and then make low bids for the enhancements from various sets that will provide what you need. For example, you could use four Acc/Hold/Rech in Flash -- in 4 slots you get almost 6 slots worth of enhancement if you used commons.