Wow, that's a tall order. To get speakers that have a fair measure of the virtues of both planars and dynamics, you have to spend a lot of money, and typically deal with something that's very big, like the big Maggies, Apogees, or Sound Labs, or very heavy, like the big Magicos.
I'm thinking that you might take a look at dipole dynamics, like the highly regarded Linkwitz speakers, which are available in varying degrees of completion. They're reasonably sized and priced:
http://www.linkwitzlab.com/
I suppose a hybrid would also be a possibility, e.g., the hybrid Martin-Logans, but I'd want to listen first, not everyone is happy with the transition between the electrostatic tweeter and the dynamic woofer. The Sanders electrostatic/transmission line woofers are very highly regarded, but very directional.
You could also check out the GT Audio, which is a hybrid dynamic/planar/true ribbon system that sells for an amazingly low price. I don't know anyone who's heard them yet, but they received positive show reports:
http://www.gtaudioworks.com/
Then there's the Mini Maggie. It really does sound like a 3.7 on your desk. However, this is a near field monitor, best listened to from a few feet away. Essentially a single person speaker, but if that's all you need, it's an unmatchable bargain.
Finally, have you considered trading up to the 1.7's, and adding a pair of Maggie's little DWM woofers? The 1.7's are magnificent sounding speakers, and the DWM woofers will give you more slam on the low end, without muddying the bass as subs would (though you can always still use subs to fill out the bottom octave). The DWM's have been getting raves at CES, where they were paired with 3.7's:
http://parttimeaudiophile.com/2013/02/05/las-vegas-2013-magnepans-big-bass-boogie/
