Many 29ers with cheaper forks might find this interesting. Especially if you plan to keep the frame for a long time.

It's not a Reba, but it's cheap and plug and play for 1.5 steer tubes. Only downside is that you need a thru axle wheel. So you may need to upgrade 2 parts at the same time. (light-bycycle carbon front rim upgrade ?)

1.5 steer Recon Gold TK 29er

Rock Shox Recon Gold TK Solo Air - 29" - 1.5" 2013 | Chain Reaction Cycles

-Feel free to move if this is not the right forum.