You can spend ALOT of money on wheels for no real gain. Max allowed for ALRC is 102 mm from the naive plate to the outter rim. Look out for 130 rims which are ok ish offset and and swb rims on the rear. I have a set of Austin champ front rims and swb rear rims for the trials motor.
I do plan on using RRC Rostyle rims because they are quite a narrow light and strong enough rim. I have de rivited one and will spin the centres around on 3 of them and leave 3 of them std.
You need to think about what you want the wheel to do. Sounds really silly doesent it but alot of money can be spent on asthetics and each to their own no problem spending money to make it look nice if it suits your needs. Just bare in mind its usually the money spent hidden in mechanicals that keep it a vehicle ultra reliable.
My criteria for a wheel for trialer/comp motor would be:
Must be Steel (can be hammered back when it bends the rim back over itself whereas alloys crack deflate).
I want a narrowish rim, Personal choice.
Ideally the ability to gremove the hub without removing the wheel. (This is where rostyles fall down).
Light as possible less rotating mass/unsprung weight always good.
MUST be max allowed offset on the front and narrow/medium offset on the rear.
Personally I don't see the point in Mach 5 rims or the copys that go for a vast ammount of cash even s/h because they offer no greater advantage over std rims they used to be very light for comp safari racing but they used to fail aswell. Zu alloys for the same reason that i would cry if I hit a rock and damaged one.
I just sold a set of alloys which are Super Super light wolfrace rims. I was tempted to keep them as they are so very light however only 15 inch rims so no go for our club and i really don't think they would last ccving.