I like SKB ATA rackcases - although some people don't think they're heavy duty enough, I've been using them for years without any problems... All SKB products are lifetime guaranteed, and they've replaced any hardware that's failed without any hassle or expense to me... I've always bought mine used, and can usually find an SKB 4U ATA rackcase for under $100 - here's a pic of my main gigging rack:
A couple of nice things about a setup like this - if it has to ride in the back of a truck in rainy weather, these cases have seals built into the lids, and they hold out water really well...
Also, the total weight of my loaded rack: case, amp, tuner, wireless receiver, surge strip, cables, etc... is still under 50lbs... I've had this one over 6 years, and probably done well over 400 gigs with it, and it's still holding up quite well...
- georgestrings