I would think that any SOs/IOs will take you up to level cap easily, so long as you slot to improve the powers strengths that you're after. And don't use more than 3 of the same enhancement within each power's 6 slots. That's it. Now, if you want to do super-hard endgame content (solo or in groups), you'll probably want to start slotting ATOs/uniques/sets/special origin enhancements, and of course, procs...it's all about the proc, bout the procs, bout the procs! ð