Move up in SNG Buy-Ins?

[studiopet]

Question for the masses. I've managed to play with most of you regulars at least a couple times whether it was a league event, the heads up thingamajob or the occassional cash table so you may be qualified to help me here .

As of late - I've been about 95% exclusive to 10$ STT SNG's and 4.40 180's. I've only played 2 of the 20$ STT SNGs (1st and 3rd). The thing is my bankroll is constant, not really going up and not really going down. I win one, I loose 2, I win one, I loose 2 etc. I'm not seeing it grow like I would like.

I don't think I'm a bad player (famous last words) and I was pondering two options:

1. Playing bigger buy in STT SNG's more often
2. Playing MTT 10$ & 5$ SNG's instead of the STTs

I don't think I want to play cash ring games because I've bee doing the tourney thing so often lately that I have a hard time shaking the tourney mentality in a cash ring game.

What say you?