I have downgraded to 1.5 and I am having a blast.
I installed IRShell also (thanks Adiuvo for the guide :) ) Great Program!
I'm not sure which CFW to up to.
3.51-M33-7 has the ability to play all games(homebrew or not) but as I have read, is hard to customize, and some IRShell features are broken
3.40 OE-A is easier to customize, but some IRShell features are broken also and it can't play the latest games.
All opinions and help accepted