I would agree with what people are saying about
free trials, GET IT! The ChikPOS trial will cost you $19.99, but it's VERY good, and VERY worth it, and when you purchase the full product, you will get a reimbursement for that amount too!!! Or you could just go to a warez site and download it =P hehe
Anyway, as to the good software, quickbook and myob and microsoft pos is
good. They are around $500 each. The non-POS editions are probably even
more cheaper, ~ $200. You should also think about ChikPOS Checkout,
that one is $269 (a little more expensive than non-POS quickbook,
myob), but it is oriented towards POS requirements.
Personally, I've had NO problems with it whatsoever. It's a Jeremy Shum
Invent so its a quality Aussie product too - helping the economy. The
features are also endless... multi-language support, managerial
decision making reports, not locked to hardware, fully multi-touch
(like iphone), external monitor support, xbrl compliant,
auto-generation of online store, can advertise "related products",
corporate chat support, show time/date/news on external screen... it's
just top stuff. AND it's Windows 7 compatible!