Okay, tentatively, if you want to upgrade your PC, here are the parameters;
Level 11
You can select a 12th, 11th, 10th, 9th, 8th and 7th level magic items (or lower, of course).
You can select 4 potions or alchemical item of level 12 or lower.
---
You can rebuild your character from the ground up; one or two players could even chance for an all-new PC if they want (for a sense of continuity, it's better to keep as many veteran as possible but I don't mind if someone wants to take this as a chance to experiment; I don't know about you, but I haven't played paragon yet).
---
At this point, having gained experience with 4e, I only have a handful of things I am wary of and most of you aren't using PCs who dabble much in them.
Double-weapons and, despite what I initially said to Gene, Battleragers are on that list. Others things like the Greatbow and blade cascade are also somewhat suspicious.
I'm not completely closed to these things but as a rule of thumb if you are entertaining the thought of using something that has proved controversial on the boards, it might be better to ask first.