Another vote for TWD pro, then TSPP. Not a fan of GB at all. It's a drainfest for no apparent reason other than to make it "difficult." TWD is difficult due to ruleset and layout, not huge gaping drain lanes. Plus, cost-wise both will be on the bottom end of your budget, unless you can find a good deal on TSPP.
TSPP has a great theme, callouts, and shots. Would love to own both at some point.