I don't believe in anything over 20s myself, but I commend you on chosing a simple, "classic" design. I hate seeing wheels that lift a car at all. If stock outer diameter of the wheels/tires is maintained, it's better. Those don't look too bad. The tires have to be just little bands though. Looks better being on an 04+ GP also.
As far as an air suspension, new you're looking at around $2400 +/- for a fully digital and complete kit. Obviously, you can go more expensive and cheaper depending on your needs, wants, and how long you search. By the looks of it, those 24s wouldn't "tuck" very well and may cause problems.
Sample kit:
Easystreet adjustable air struts
Auto Pilot Digital Controller
Controller Mounting Bracket
Digital Controller ECU
Pezio Transducers
Anodized Manifolds
1/2 Airline
Our Air Line Cutter
VIAIR 380C 200 psi Compressor
5 Gallon 8 1/2" Port Tank
Inflation Valve and Drain Cock
Wire Harness
Thread Sealant
Compressor Relay
Nickel Plated Fittings
All Necessary Mounting Hardware
