Hi all. I'm planning a new crit racing bike and have a few options that I'm considering. My idea is to go aluminum. A bit cheaper on the wallet, with frequent racing accidents. I was thinking about a new Allez Sprint frame, but there's so many options. So I'd like your advice on the following:

CAAD13: I got a line on a CAAD13 for a really good price. But I understand that this is a more "relaxed" frame from the CAAD12. Thoughts?
CAAD12: I can get one in like-new shape, but it's about $900. Seems a little pricey, but I'm told it's really stiff and aggressive.
Giant Aluxx SL: Older frame (2006?), but really good price and it appears to be a really well appreciated, stiff frame.
Pinarello Dogma SL4: Carbon, but it's in great shape and a super price.

Let me know your thoughts. Thanks!