Sound
Shells
Shells are subjective. Some people like the cheap woods, some people like the high-end ones. Doesn't matter.
It's mostly in the heads, so invest in good drum heads (e.g. Remo, Evans, Aquarian, etc) Bad shells + good and well-tuned heads is always better than good shells + sucky heads.
There's a thread about heads, and one about tuning them.
Cymbals
Bronze is better than brass. Higher prices does not mean better... it just means there are more processes involved in making it.
Durability
Cheap hardware almost always means not very durable. Like Squier vs Fender (knowing that you're a guitarist, hehe)
Prices
Like guitars, always check 2nd hand prices and prices online. Also, info on series, brand, etc are probably as abundant in the web as that for guitars.
Drum forums are also useful. For starters:
www.pearldrummersforum.com,
www.drummerworld.comHappy hunting