The B8 grip is a classic; I flew with it for years on hueys and ever since we sent a couple to the boneyard have been trying to get hold of an actual B8 grip and remake it into a home controller (not only for the sentimental value--it's a darn comfortable controller and the actual for-flight grips are REALLY tough).
Unfortunately they are silly expensive, so I've considered something like the Happ. You can get home controllers modeled after the B8; the old Thrustmaster FCS and Top Gun joysticks are slightly scaled B8s, and the Thrustmaster X-Fighter is a full-scale B8. All three of those are typically available from ebay for a pittance since they use the old "Game Controller" interface of ages past.
With a bit (actually a fair amount) of hacking, you can use those as modern HID controllers (I've got an old Thrustmaster FCS/WCS combo set up as a HID controller through an Arduino; makes flying helicopters in Battlefield: Bad Company 2 almost bearable, even though the throttle doesn't work with their braindead control system). So you could use those in a cab pretty easily.
I'd be curious to see your review of the Happ B8, though, in terms of sturdiness and feel; as mentioned, the actual grip is MILES away from the Thrustmaster copy, so if the Happ has the right feel I'd be sorely tempted.