that shud be more than ample for surfing. and will do the job for photoshop ( depending on card) as long as its not antialising landscapes etc

as fordesktop system i can get
intel pentium 4 2.8ghz
512mb ram ddr
120gb harddrive
52x32x52 cdrw
16x dvd
128mb graphics card
soundcard, modem, speakers, keyboard, mouse, for £450 +P+P