What good paintball gun should I get for seedball that is under $150?

Alpha Black is more for woodsball or milsim/scenario. It'd be out of place in speedball. If you use (or have to use) co2, look into the Smart Parts Vibe. If you can use hpa/compressed air, look into a Smart Parts Ion. Both are under $200 (Vibe is $150, some places sell Ions for not much more). You'll need a good hopper & tank, however, and that can make the price possibly go over your budget. Look into spyders, like the Electra or Pilot, both should be under $100. For an affordable hopper, check out an Invert Reloader (about $45). Co2 tanks are cheap, like $20 or less, depending on the size. HPA tanks cost more, $50-200 depending on brand & type (steel or carbon fiber). Any good shop will consider package deals, where they'll shave a little off the price if you buy a whole setup. Free lifetime warranty is a shop standard & shouldn't be considered the only incentive.

You can get a diablo wrath or slayer with nitro,loader,pod pack and tank cover for 150 on E-bay! Brand new!!! I play with an Angel speed (The Gat) and it out shoots my Angel! 22 balls per second. I was so surprised. One wicked gun!

Get the smart parts ion its a great gun i had it for 3 years and i had no problems with it. it very accurate and light.

alpha black is not really a good speedball marker. Maybe look for an electric sypder. Also get a good hopper.