Sice deepbit is SO big, i dont like at much as before, so im thinking to change to another MINING server.
What server you think is better? Why?
I have 275MH/s, i have to use proportional or pay-per-share??
There's a neat pie-chart at bitcoinwatch.com
that gives a good idea of sizes. For what it's worth, I've used Slush's pool and btcmine most of all: both are medium-sized, and I've had no real trouble with either. Slush's pool had an issue recently, which caused many people to drop out and that caused the pool size to go from massive to medium - and deepbit to go from medium to scarily big! That's the only real issue I've ever seen with Slush's pool - any other issue has been with the website, rather than mining. Btcmine I'm using right now, and have used on and off for a while - never had any issues with it. It lacks some of the fancy GUI stuff (graphs, etc) that Slush has, but I can live with that. The fee is voluntary, as well - you can select anything from 0% to 5%, IIRC.
There are a couple of new, smaller, pools that have started recently - I'm conservative, and haven't tried either yet, but they might be worth checking out.
I can't really answer for proportional or pay-per-share - I've never really used pay-per-share - it tends to be more expensive in terms of fees.