Good old standards.

GoldbergTiger II
Sig Something Extra
Sig 4*
GP Super Sportster
Goldberg Skylark


And the not so old standards
GP Rapture
Pheonix Models Dolphin
Any Stick type plane (though not low wing)

Most of these models are rated up to .46 or so, but adding a 50 will not make them "fast and furious". They will nearly all slow down as slow as you want them to. My top pick would be the Tiger II, 4*. then teh GP Supersportster.