2000 or less : best choices for mains?

My experience with Paradigm Reference speakers is that they can sound excellent, but the quality of upstream components is key.

It's amazing what these speakers can do with high quality sources, cabling, and recordings. I think you're doing well for speakers in this price range, especially if you add in their excellent Servo-15 or similar. I can't recall if the S-15 has a continuously adjustable phase control, but if it does, it can help you with nailing the sub imaging right between your mains.

I think what I'd do if I was you is make sure you have your speakers on good heavy stands, then put extra into raising the quality of the other pieces. Cables might be a good start if you don't have quality ones yet.

The Servo-15 if you get it with the companion X-30 crossover does have variably adjustable 0-180° phase. I own the X-30, but have never heard either the Servo-15 or HGS-18. However, I would suspect that the HGS is bit more of a HT sub than a music one.

If you intend to do any music listening, I would stay away from the Paradigm Servo 15. It has tons of bass and is tight, but it's not that musical. It's tough for a 15" to be real musical. I would give the 60's a listen before you settle for the 100's. The 60's will image better and may be a little more accurate in the lower midrange because of the decreased woofer. Especially if you are adding a sub, you shouldn't need the 100's, unless you like their size.

If you have the slightest DIY in you look at a Northcreek Kit. The Rhythm speaker is nice. Or go to Madisound Speaker Building forum and do one of the kits you run into there. From Tim Murphy or one of the better builders at Mad. They will blow away Paradigms, IMHO.

Cheers,