I reckon you should get the Antec 300 as your case of choice I've got both 300 and 900 and the 300 is much better with the inclusion of the dust filters.
Also like ashcrimson said you should choose a better power supply the no-name yum cha ones are known to be dodgy, avoid SHAW like the plague as I heard whole systems being ruined by SHAWs dieing.
Anyway have a look at johnnyguru's
site for decent psu reviews.