Longshot, Longstrike or Stampede?

I already have a Nite Finder, Recon and Raider. I have been thinking about getting a sniper and haven't been able to decide between the Longshot and the Longstrike. I like the looks of the Longstrike but have heard the Longshot is better but its really a bit bulky too. Now they've brought out the Stampede and I am wondering if I should get it instead. I can't decide! Please give me your opinion on these three awesome Nerf guns.