Soma San Marcos. $930 for frame and fork. it was actually co-designed with Grant Petersen so you get your Riv fix. Lugged and high quality tubing with a sport-touring approach to geometry.
San Marcos Frame Set | SOMA Fabrications
Soma Saga. $500. Not lugged, but touring frame for more relaxed position like you want. Excellent tubing.
Saga Frame Set | SOMA Fabrications
Soma Grand Randonneur. $490. Partially lugged, 650b funky trendy wheel sizing, and more relaxed geometry. Same great tubing as other Somas.
Grand Randonneur Frame Set (v.2) | SOMA Fabrications
Velo Orange Pass Hunter. $540. A few superficial lugs(I think?) but its a well thought out bike.
VO Pass Hunter frameset - Frames
Velo Orange Campeur. $520. Lugged and very well thought out. Its a touring frame, so plenty of mounting points and more relaxed geometry.
VO Campeur Frameset - Frames
I know not all are lugged, but all are cromo and the Soma models are an excellent brand and model of tubing. There are hundreds of frame makers that could be listed who build lugged frames, but I figured id toss out a handful of frames that are more relaxed geometry, steel, and lugged(some) while still costing under $1000.
You are in a really cool situation- oh how should I spend 2K on a unique steel frame build? That's a great problem to have!