[tential]

If you spend under 150 then be prepared for the experience to reflect that. XBMC will run, but it won't be snappy and I'm not positive how it will handle a much larger library.
Personally, I'd read the stickies and build one of those pcs for 220-280. That's your best bet.

[00b5]

OUYA $99 - no remote, comes with a controller though, and you'll have to mess with it, side load xbmc/xmbc ports/etc

Pi - Already covered

Intel NUC - you can get a celeron one for cheaper than the i3 listed, or the new bay trail one seems to be shipping. They are all barebones, so you'll need to buy RAM, and either a hdd/mSATA drive, or use a fast flash drive and something like OpenELEC. Still more than $100 ($200 is more accurate i'd say) but at least it's just a tiny PC with options, as opposed to some of the other android based options, etc.

You can probably still find a lenovo Q190, but thats an entire PC, ready to go (includes ram/hdd/etc) and at least $300 i think.

You can use the celeron/mb combo here, and just build it into a case you like, add as much or as little, etc and be done. I think a NUC is cleaner though

[fisherman55]

I bought a Ouya, for $99.00 to try, and it works great, and streams as well as my AMD-A10 5800K HTPC. The remote takes getting used to, but still is more than adequate!

[ruffpl]

And what do You think about this one?
http://www.ebay.co.uk/itm/NEW-X5II-Quad-...20dc46b004

[Ned Scott]

And what do You think about this one?
http://www.ebay.co.uk/itm/NEW-X5II-Quad-...20dc46b004

Looks like the same thing as the MiniX Neo 7. If you don't mind learning how to flash it with a better firmware (the ones these boxes come with seem to always suck) then it should be a good little box.

[lifeisfun]

And what do You think about this one?
http://www.ebay.co.uk/itm/NEW-X5II-Quad-...20dc46b004

Looks like the same thing as the MiniX Neo 7. If you don't mind learning how to flash it with a better firmware (the ones these boxes come with seem to always suck) then it should be a good little box.

Perhaps the X7 mini (no external antenna , less NAND)
http://www.geekbuying.com/item/NEO-X7-MI...18426.html

[eskro]

or, go with something like this http://forum.xbmc.org/showthread.php?tid=183949

[JPRS]

For something cheap and cheerful that will run smoothly (if you configure it correctly) and will play 1080p without missing a beat, you can't beat the Raspberry Pi. Got mine set up, with a fully functioning remote, wifi dongle, USB 3.0 stick (highly recommended for fast, smooth use) and high quality case for less than £50.

J

[vmstek]

ATV520e works well. And apparently even better with the minimal Linux install.
Add an external drive, $25 wireless keyboard, (it does come with a remote) or use XBMC remote on your phone.
Stick to the Android OS, and you have Mail, Skype, browser, games etc.
WiFi, Ethernet, very small