most of those 5 year old olympus'* in the $500-$800 price range are a good buy..you can usually snag them for under $70.
Olympus C-4040 ($1100 orginally, now under $100)
Olympus C-4000 ($500 originally, now under $80)
Olympus C-3040 ($800 orginally, now under $70)
Olympus C-3030 ($1000 orginally, now under $60)
Olympus C-3020 ($600 orginally, now under $50)
check the reviews on these:
I've had good luck with used (high end) olympus cameras in the past, however with any brand you should be ok as long as it is a $500-$1000 camera when it was new 5 years ago.
I shot this photo:
with my C4000 which i got for around $100 a few years ago. Now they are even cheaper.