Harbor Freight sells a great case that fits perfectly for $32 ($40 + 20% off coupon). Shipping is pretty cheap if you don't have one near you:

Aluminum Tool Case - 17-1/2" x 12-1/2" x 7-1/2"

That will easily get you thru first year pay. After looking at others cases, I wouldn't buy a case that does not have metal skid guards. No matter what type of case you have, the bottom will get chewed up from constantly lugging it around.

My rec: Buy the cheapie to get you thru first year pay and then evaluate what you want.