DFI is the best, i have had one but it fried because i had gay ram but i had overclocked my e8400 to about 3.8ghz and one and now i am currently trying to find a cheap one but i would definately recomend you get one if you start overclocking. you won't regret it
well i have been an owner of a psp 2000 (4gb, 2400mAh battery, 3.90 m33-2) with a bit of other mods for about 4 months already and i have to say u really dont need a case b.c i;ve dropped mine various times and nothing hapend except minor scratches but unlike psp 1000 the wifi doesnt get messed...