I run a 120mm Reba Team 20mm bolt thru, a Reba SL 80mm QR and a 100mmm Suntour Epicon 15mm bolt thru.
All the forks are good but the Suntour was by far the cheapest (now on offer for around £170 on CRC. Downside is that it is 15mm only so that usually means new hubs unless you run Hope or Halo's already. Clubber did a big review on here about them, do a search under Suntour Epicon.
Reba's are expensive but pretty good. Some newer 2011 forks are starting to come out now (Reba & Recon). Tora's are good but heavy. Manitou Minutes and Drake get reasonable reviews but i've never tried them (i have a mental problem with Manitou for some reason?). Fox supposedly very good but also very expensive and hard to get hold of.
The suntours are around 1800g (without the 15mm axle) and have two versions with remote lockout or fork mounted lockout if that helps.