If you're talking about the Cryptological 2.25 pound tourneys, preflop I would go all in with AA, KK, maybe QQ and maybe AK/AKs.

The reason being is that the blind structures are very fast (10 min) and the play is horrendous. Many times you will get sucked out, but many times you will double and triple up and get enough chips to wait for your big premium hands again.

I'd get my money in with AA KK AK AKs QQ.

-PN