I have a Tornado, and even though its one of the most compact crossbows out there, I don't have any problems with it, and I'm a fairly big guy with long arms.
I was also looking at the Cyclone, but was told by Wyvern (who is well respected when it comes to crossbows) that the Tornado in his opinion was Parkers best crossbow. It's more balanced than the Cyclone.
But I'm sure you'll be happy with either of them, because for the money, they're hard to beat! I know I'm extremely happy with the Tornado.