if you wheel it, go with the 488's. i run a 5spd and 35's (bfg so a little small) and still need more gear off road, but it's better than 370's. i ran stock gears and no turbo for years with 35's, it sucked, but i still got around.
as far as highway goes, the 488's are fine with the 5spd and 35's. how fast do you want to go in a wagon on 35's? really, anything over 100kms is starting to get a little scary.
all i can say is, is there such a thing as having too much gear? if you wheel it you'll still want more even with 529's.
like stone said you should be able to find a good used h55 around in van in the 1000-1500 range depending on condition. maybe less.
can any of you vancouver cruiser heads help this guy out? i'd offer my spare up for sale.... but then i would'nt have a spare now would i?
that's my 2 cents
crusty