Old Slow Mac Minis that are or can be made equivalent of Apple TV 1 + Crystal HD?

I love my ATV1 + Crystal HD XBMC setup. A Mac Mini that can be made or is equivalent of ATV1 + Crystal HD?

I am wondering which Mac Mini (how old or new of a Mac Mini Model) could do the same / be equivalent with or without the Crystal HD?

Which of the older Mac Minis (with or without Crystal HD) can work as well as at HTPC Group 3 EQUIVALENT as per Eskro's rating system i.e. ATV1+Crystal HD Card?

Something less powerful or not as new but EQUIVALENT to play the Group 3 stuff would be good enough. So which MacMini hardware can it go down to?

How far down the Mac Mini line can we go?

Quote Originally Posted by eskro View Post
Group #3
* HDTV possess HDMI ports
* wants to play SD movies (DivX, XviD)
* wants to play DVD movies
* wants to play 720P movies
* wants to play 1080P movies
* wants to stream 1080P Hulu content

Best Served By?
* AppleTV1 + Broadcom Crystal HD
(sole way for playing 1080P via purely Component HDTV's)
(Hulu requires Bluecop's XBMC Hulu add-on or the use of a Linux distro)
From which Group do you belong!? - XBMC Community Forum

The objective is to be as powerful as this for playing movies from a NAS.