Ok, after browsing Tom's Hardware for about an hour, I manged to dig up a LOT of information on CrossFire and, at least from my perspective, how much better it is then SLI.
Tom's Hardware has a brief article that states this about the X1600 series cards...
Originally Posted by Tom's Hardware Guide 14 Dec 05'
Sapphire Technology announced yesterday that it has begun shipment of its new Radeon X1600-series graphics cards in two versions.
The series is fully compatible with and ready for use in pairs in CrossFire dual-graphics systems, said the company.
From my interpretation, it's saying that the X1600 cards have integrated CrossFire support, meaning, you can pair either model up and have full CrossFire support. This explains why mutiple people in reviews of the product keep claiming two X1600PROs in CrossFire.
This confirms it I believe, that I will be purchasing two X1600PROs in 512MB GDDR2. This layout seems much better then my previous 7800GT layout, not to mention I get twice the performance in video memory, 1024 as oppossed to 256, and two GPUs, all under $300, as oppossed to the 7800GT which costs $285 dollars. So, I think that this X1600 setup is the best performance-to-cost ratio that exsists at the moment.
Anyone have anythign else to add or that could guide me in a possibly better setup?