I have the 120mm bolt thru 29er reba's – excellent forks if you can get hold of some.
Tyre wise – i run Rampages on the full suss, captains on the HT & nevegals 2.25/weirwolf 2.55 on the SS. I also have Small Block 8's for the summer and Mud X for the winter. I'm unlikely to replace the Rampages once they are worn although i'll see how they cope with the drier summer trails.
Good people on here to recommend tyres for 29ers are Bonesetter and Ton as they've both been through most of them!! Bonesetter is currently running the 2.4 Ardents and rates them highly. On your lightweight build i'd expect you to run light tyres (my salsa is 30/31 lbs – it is a 22" frame though). Schwalbe do some light ones but the Captains are only around 600g each.