Help With Small Room Speaker Decisions.

SUBLESS was your best choice.

I have tried and failed to use subs in a music only two channel system.

Congratulations, looking forward to your impressions

Thanks for the suggestions!  
 

I ended up ordering a pair of both M30.2 XD and P3esr XD.  I’m kind of broke after the purchase so the P3s will have to convince me they’re the ones without subs involved. Couldn’t resist having all three of the smaller Harbeths, all modern versions, in house to play on my two systems. It will be a lot of fun to get to know each and decide which fits each room best. Although with the wife I won’t have a lot of time before I have to sell one of the pairs. 

Tannoy Autograph Mini's are a pair I would check out as well

+1 get the sub

My office system consisted of Totem Mites on stands, with a small matching Totem subwoofer. Powered by a PrimaLuna Integrated. It sounds great, natural, punchy. My room is of similar size. I use the system from my desk while working and sometimes push my chair back and listen.

I am personally constantly impressed with my system. Have you exhausted room setup? Also, the Totem sub is absolutely beautiful, small and matches. I find the small size of the Mites a real advantage in a small room.

If I’m not mistaken the SVS doesn’t allow actually DSP in the sense you can not tweak the frequency response. That considered I lean towards Rel because I get the impression they may have a bit better tone. Also no sub out on my Primaluna and Rel is made to be ran through the high level inputs, not that I couldn’t with SVS. 

I like with subs that I could add DSP and such alleviating possible issues in such a small space.

Bingo!  That’s what I’d do.  Trying to deal with larger speakers in that room could be tough, and a pair of small subs like the SVS SB1000 Pros that include integration software will not only make dealing with bass much easier but also get you down to an honest 20Hz for only $1150 (and a generous risk-free trial period) that makes a huge difference outside of just bass and you won’t get near with larger Harbeths.  I think a pair of P3esrs with a couple good, small subs could be sublime, although the Rainmakers are also excellent speakers so adding subs to them may be all you need unless you crave that Harbeth sound.  Hope this helps, and best of luck.