Help me recommend some speakers for a friend

I've been helping a budding audiophile build a new budget but still nice system. He lives in another state, so it's been an exercise of email swapping. Some items have been my recommendation while others are of his own choosing.

So far he's built a system with:

VPI Scout with a Sumiko Blue Point Special
Project Phono Box SE II with RCA tubes
Yaqin MS-13B (a ~50W Chinese push-pull EL34 amp)
Kimber 4PR speaker cable
KEF iQ30 speakers on stands

The KEFs were a good upgrade compared to his older speakers, but he really wants something with more bass. The problem is he has a smallish room with wood floors, so I'm not about to recommend a large floorstander or panel speakers. Any recommendations in the sub-$1k category?
I second a subwoofer, but not necessarily a REL. Lotsa good subs out there, such as JL, Martin Logan, PSB, Paradigm, B&W, etc. For KEF monitors I would have looked at the XQ series from for near what he paid for the IQ's. Should have higher resolution. He'd still need a sub or two.
thanks everyone. I'm normally not a fan of subwoofers (I'll admit my experience is minimal with them) but this may work out best for him.
Tekton M-Lore, about 95db efficient, 8 ohm nominal impedance, gets down to 38hz, $649.00, see Stereo Mojo review, received major mojo award. Seriously good.
Another vote for the Tekton M-Lore, should work extremely well with the Yaqin amp.