Well I said difficult, not impossible.
Here is a sub US$100 android device that beats the ouya as far as HTPC duty goes.
G-Box Midnight MX2
http://www.cnx-software.com/2013/05/06/matricom-g-box-midnight-mx2-android-tv-box-review/Very comprehensive review.
Specs below.
Seems to be one of the few Android setup boxes with multi channel audio passthrough. A must have feature for HTPC duty if you have surround sound speakers (like I do). The OUYA lacks this.
G-Box Midnight MX2 Specifications:
* Amlogic A9 Dual Core Neon HD CPU
* Mali400 Dual Core High Performance 3D GPU
* 1GB RAM (DDR3)
* 8GB Total Internal Storage
* USB Storage Extendable (Flash Drives/HDD)
* SD Storage Extendable (Up to 32GB!)
* 802.11b/g/n internal Wifi
* HDMI v1.4 video output
* 10/100 Ethernet Port
* Coaxial SPDIF Digital Audio Output (Surround Sound)
* Composite Audio/Video Out
* 4x USB 2.0 Ports
* Android 4.2.x Jelly Bean installed
* Supports Wireless USB Keyboard/Mouse
* Google Play Store installed