Are you planning to carve/stamp your projects? You will need at least 5-6 ounce veg tanned. Get a shoulder if you want all thickness to be nearly same weight. A back will give you some thinner leather in spots you can use for card holders. The garment leather is fine for some purse designs with no tooling. Buy ready made wallet/purse liners, you won't need another leather to line. Large carved purses do best with 6-8ounce veg tanned.
ferg
quote name='RunKittyRun' timestamp='1343255842' post='257923']
For wallets I think you want something like 3-4 ounce veg tanned. Springfield leather will sell you a smaller, like 5 sq ft. piece. You're also going to want some lining leather like pig or sheep in the 1 ounce range.
Straps would be best with latigo or harness leather I think,
For bags and such you'd want a 3-4 ounce garment leather. That would be chrome tanned. It's softer.