(I tried the Midwest crate, but the vertical wires were sharp on top and I scratched/cut myself a couple times before I had to take a file to them.)
The Precision "Great Crate" has two doors, one in front and one on the side for convenience, folds nicely, not too heavy, and have a nice heavy bottom pan. The 4000 is 36" x 23" x 26" and is available today on Overstock.com for $77.99 with free shipping.