2 x1800gtos or x1900xt

I'm looking to build me a new system upgrading from socket A to AM2. I was going to buy a x1900xt with the iceQ3 cooler from HIS, but looking into somethings suggest that maybe two 1800gtos will work in crossfire on new 3200 ati chipsets. Only problem is I cant find a crossfire am2 board for sale. Does anyone know if 2 x1800gtos will work in crossfire without a mastercard and if it will be faster than a x1900xt. I've also heard that the x1800gtos can have their bios flashed and made into x1800xls. The cost is about the same.

one x1900xt.. they're cheaper, takes up only one PCI-E 16x.. and one less hairdryer in the system..

Plus you're probably going to encounter less driver issues if you dont use Crossfire...