go for 26/24
Yeah go for a 24 inch back wheel.
I've heard bad things about mag30's (heavy, cracks, flat spots, expensive).
I'd go for the go old Sun Mamoth/BFR or the rhino XL, all available in 24 inch.
I've got a dice24 and they flat spot really easy.
Remember you dont need a super strong rim as a 24 is way stronger than a 26 to start with.
For racing the best tyre is probably the intense 909 24 X 2.5 SR.
Its the softest compound 24 inch rubber you can get.
For all purpose stuff the highroller 24 X 2.7 is pretty good (more like a 2.5).
Never tried the Kujo, should also be pretty decent.
I've heard the kenda 24 X 2.6 SR are good too.
I've got a bighit with an Avy DHS-RC and 9 inches rear travel via a custom linkage.
Beleive me there isnt an issue with the 24 in the rough stuff if you've got an avy.
Also steer clear of aireal hubs, I've had nothing but trouble with Aireal's hubs as have others I know (seized bearings, in a brand new hub).