For games i would stick to the commodore 1084 monitor or the phillips cmi8338, both have stereo speakers built in and are readily available on ebay....i have 4 of them :-D
Internal 2.5" are very cheap on ebay too and you can have up to 4 gig without running into problems and this is tons of space for an amiga.
only other thing i would suggest is a ram expansion, even a 4mb one makes a huge difference but better still is an accelerator with extra ram.
