Quote Originally Posted by WILL
Might I ask if either of you guys know what the max. capabilities of XNA on a 360 would be?
Benjamin Nitschke is pretty much at the forefront of XNA development from an indie point of view. Check out his blog at http://exdream.no-ip.info/blog/
In particular have look at Top down shooter video and also the XNA Racer screen shots that are all supposed to run on an XNA 360 at 1080p resolution. Another one of his game called XNA Rocket Commander come with full source code and the shooter and Racer game will also come with full source when his book is released.

Here is the top down shooter :
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All seem to run at a fairly decent pace on the XBox 360. The main caveat he mentions is that don't create things dynamically on the XBox and don't use For Each loops as this really slows things down. He lists other tips and gripes he has about XNA compared to MDX.