Hagar,
I gotta agree with Quads on this one. I had the same problem sometime last year. I was still playing 3/6 mostly, but I think I had grown out of it. I was sick of the suckouts, and figured, hey why not BR a little more and take a stab at a higher game? So I saved up a little bit, brought $600 and played the 9/18 at Capitol... never looked back from there. I still play 4/8 at Derby quite a bit, but thats mostly killing time until a tourney, NL or 12/24 opens up.
You've got the skill to play these levels, and with your good solid game you should be able to make it no problems. And the best part is, no super suckouts!!
-David