What you want is a Prior 4WD or a Donek Axis, probably in a 170-ish length. Coiler makes a direct competitor, the AM, but as you point out delivery is an issue. Either of them new will chew up all of your budget, though. If you check the Prior website you'll find some used/demo boards for a little cheaper.
If you want to do this on the cheap, you could get an old Burton Alp. There's some NOS ones at Klug's site, see here. The 64 would be a good starter board for you but at your weight it's probably pretty soft - I think you'd outgrow it pretty fast.