There are a couple of 'Velocity' xbows out there, one by Scorpyd [big $ but good co] and another from my googling the name.
I shoot a Y-25, which is a fancy stocked Exocet 200, get 310 fps w/ 400 gr arrows which suits me fine. Deadly accurate w/ BEE arrows.
I shot a 125 lb draw Scorpyd that a friend had here, great shootewr but heavier than I'd want. I was looking thru the scope at the bull at 30 yds and realized I'd shot it when the vanes appeared in the scope, centered in the bull, lol.
My advice qwould be to look for a used Exocet or Phoenix [warranty transfers] or call David at Wyverns and ask about a 10 pt Wicked Ridge if you like wheeel xbows.......