I am all about finding nice factory built cabinets to use. I don't want to knock anyone's offerings, but the original stuff is the best.
Plus, it is SO much cheaper.
Approximate price totals spent on each of my projects (including EVERYTHING).
Artic Mini Mame. $125 (also had a monitor left over, which I gave free to the guy who hooks me up with stuff).
Amazing Mame $172 (total cost was $272, but I got $100 for the original monitor).
Mame Firebird. $10. (everything but the PC speakers was leftovers and freebies, if I had to have actually bought the stuff it still would have been under $100).
Tournament Mame. $80 (should have been $70, but I blew the original monitor, and replaced it with an old 14" PC monitor, which I valued at it's thrift store price of $10). This one also produced some spare parts that may bring in $40 or $50.
Battlezone (Mame). Currently incomplete, but under $100.