While I hugely like the look of the Fox, they are an orphan for a number of parts and awkward to work inside.
The CVRT family obviously have appeal because of tracks, my favourite being the Spartan because of space and ease of driving, the gun tanks are nice but claustrophobic in my view for the driver.
The second generation of the CVRT in the form of the Stormer are really nice, if you can find one buy one. As to whether to buy the one with the firing post or the Troop Leaders Vehicle thats your choice. They are so much nicer than the first generation, better seats, better and safer engine.
Robin