You've gotten a lot of good recommendations from some knowledgeable folks thus far and I echo much of the sentiment around PSA, HSU, and Chane - all solid companies that offer great products and customer service. I also have a preference towards Denon and Marantz receivers with Audyssey, it just plain old seems to be the best room correction software out there today. As a point of reference, they are both owned by the same parent company with Marantz being the 'luxury' line so to speak. Given your room dimensions of 13x18x10 you've got about 2340 cubic feet of space to work with, which is not a hard sized room to fill up with brilliant sound and earth shaking bass. I'm thinking a 5.2 set up would be great to start and agree that bookshelves are probably the best with your space. With that, I'd offer up the following suggestions:
: Grab yourself a Marantz SR5011 (7.2 capability) or it's bigger brother the SR6011 (9.2 capabilitity) if you really think you'd ever go up to 9 channels. Personally I think the SR5011 would be plenty for your room. The Denon equivalents would probably be the X3300 or the X4300. I'd strongly suggest you purchase the receiver from Accessories4less. It just doesn't make sense to pay full retail for a receiver, when there are gently used factory refurbished models out there. I bought mine there (as have many others here) and I honestly wouldn't have known it was a refurb ahead of time when it showed up. Great customer service.
: With your budget I'd offer up 3 different choices, at different price points, and I think you'd be mighty happy with any of them.
A) PSA: Four MT-110's to serve L/R and Surround duty. Couple that with a heavier duty MTM-210C for a center channel. The center is the most important piece of any HT system performing 80%+ of the work, so that's why I like to step it up there. High sensitivity speakers- will hit reference for you without breaking a sweat. This comes at a cost of $3574.95 before shipping.
B) Chane: Here I think you'd be a great candidate for five A2.4's all around. Rotate one of the tweeters to serve as your center channel and the remaining four as your L/R and surrounds. Sensitivity is a bit lower, but with the aforementioned receivers, you can get them plenty loud. Don't mistake their lower cost as inferior speakers- I mean these puppies can play! Total cost for the five speakers is $1345 before shipping.
C) HSU: Grab yourself four HB1-MK2 bookshelves and a single HC1-MK2 for center channel duty. Again, little lower on the sensitivity side- but will still have the impact you want. *I haven't heard these, though they are supposed to be great. You may consider stepping up to their CCB series, others here could better describe the differences between the two lines. For the MK2's you're looking at $885 before shipping.
: With your sized room, I think doing 18s would be totally awesome- but I also think it would be a little overkill, as you'd never use all the headroom (or maybe you would
). With that said, I'd recommend two ported 15s and I'd go with PSA or HSU. Honestly, you really can't go wrong with either company or their products.
PSA: Snag two V1500's, maybe place one nearfield. Two of these would provide enough power to not just shake your butt in your couch, but the walls of your room. $2199.98 before shipping. *Look for B-stock!
HSU: With these guys I'd go with two of the VTF3- MK5 HPs. They'll hit all the lows and provide equally strong depth as the PSAs. $1598 before shipping.
Any combination of the above keeps you at or under your budget and they'd all perform admirably. There are some deals to be had with HSU as well, doing package combinations, that I did not list out here. As others have said too- I'd recommend reaching out to the owners of these companies, who really float around here at AVS and give honest, non-biased advice to their products and competitors-- Tom V (PSA), Jon Lane (Chane), and unfortunately the gentleman from HSU is escaping me, but I think it's Mike? Anyhoo, happing hunting! Let us know how you make out!