Sadly, I forked out a pretty penny to build this machine in December 2010, which wasn't that long ago. I won't be able to justify spending money to upgrade/rebuild the machine again to get a mobo with UEFI (which would require me to get a new CPU because I doubt there's any socket 1366 triple channel memory boards with UEFI hanging around here in late 2012). That said, if nature forces my hand (mobo dies or something), I would look into a UEFI-enabled ASUS mobo and a decent i7 of the latest generation of Intel offerings.
I feel for you. I was reluctant to give up my X58 based board as well, although my rig was getting a bit dated (bought an i7 920 back in like '08). I was concerned about the dual vs triple memory bandwidth, but my new Z77 based i7 3770K shows far better performance across the board, even with only dual channel memory.
I got this entire rig for about $400 (Gigabyte Z77X-UD5H, i7 3770k, everything else was compatible). Still, I can understand not having an extra $400 laying around. Many of the x58 boards have UEFI bioses available to download and flash. They're sort of "silent" UEFI, because they provide UEFI but still in a text-only interface.
Only thing is, if I had to replace my mobo, that's bye bye triple channel memory. I would have to either lose a stick or buy an extra stick of RAM to compensate. As far as I know, the socket 1366 bloomfield boards were the only ones that did triple channel memory.
No, because as I said, there are X58 boards that have UEFI flashes. However, an X58 chipset board is pretty expensive, and you could probably be close to buying an Z77+i7 chip for the same price. In any event, memory is so cheap.. you can get 16GB for about $100.
BTW, there are really high end boards with more than 2 channels. For example. the X79 chipset offers Quad channel, but you have to buy a socket 2011 i7 like the i7 3820
ASUS - Motherboards- ASUS P9X79
