I've used both .103 and .122 (now) with much success...there are those who will swear by the hybrid ones, but quite honestly, I'm not as technically experienced as I feel I would need to be to install any of those. Plus, I'm lazy as heck, so the less work I have to do to upgrade - the better.
I'd lose .75 as soon as you can though...about 1% of STORMs run it just fine...the rest are buggy as hell. Hope you get a good one...if you didn't, there are plenty of options.