That S13 is good man,
You will have to spend a fair bit of coin on getting it to slide really well however given its a straight swap for the R31 I'd say thats pretty decent deal for yourself man.
Just had another read on ns.com of that G1 thread. Even more depressing to see the 'big boys' of the drift scene act like they are.
Goodluck finding the right skidder man, there is so much about for sale once you sell your car.