Soooo nearly bought a Mohawk a couple of years back myself - that said, if you could find one, I reckon keeping hold of a good JB1 is more sensible than a swap for an unknown Mohawk
An Air Logic Genesis would be very nice - but as you say, few and far between (there is actually a buyers guide for these posted in the collectables section - I just had a read!)
All of the ssp rifles are not common and I think very definitely only appreciating in vale.
I'd love a .177 Dragon with Mr Wilkes mk2 special adjustments in the ft stock (probably a bit less common than a genesis!)
My Dragon needs a strip as it is valve locked again after I put it away right way up (or in the case of a dragon definitely the wrong way up!) in the rack over night and not horizontal on the top shelf in the cabinet.
I would love to know what fettling was done by the Parker Hale wizard to resolve the hydraulic lock issue - I've looked but decided never to touch and just store correctly (usually!)