You can get a new sid really cheap on ebay. They can be shimmed for 40mm less travel than stock, so you could use anywhere from 80 to 120mm.

Make really, really sure you get the right options. You need a 1 1/8" straight (NOT tapered) with the travel I mentioned and 15mm axle. (I dont think you can get a sid with 20mm, and I wouldnt use a Revelation on a short travel bike.) I believe the current World Cup forks are all tapered, but the XX is no slouch. Under $700, easy.

On your hub, it needs the same spoke count as your rim. I would use new spokes and nipples.