UEFI "BIOS"-s are fine, but do NOT (and I cannot stress this enough) format your hard drive as GPT/GUID. It is nothing but trouble, either on Windows 7 nor on Windows 8.
Windows is NOT ready for GPT - none of the MBR tools work on GPT systems (even if they think they are - due to the "fake" MBR). Windows also handles GPT entries in the uEFI boot menu incorrectly.
As I said, the new BIOSes (UEFI) with better mouse support and a few more toys are just fine even if they are a tiny bit more buggy on average than traditional BIOS-based systems.
GPT/GUID is NOT fine. It means you'll have 4x different ways to install Windows:
- 64x MBR
- 64x GPT
- 32x MBR
- 32x GPT
None of which are interoperable. So if you have a mix of MBR and GPT on one system then you're screwed. If you have a mix of 32x and 64x then you're screwed. If you try to install Windows twice and have any GPT partitions then you're screwed.
Also Windows will refuse to remove GPT once it is on a partition. Many of the tools which are meant to wipe a drive instead just wipe the new "simulated" drive without touching the fake MBR or the reserved space (including Disk Manager).
Honestly GPT is a giant clusterfuck. The second >2.2 TB drives become popular there is going to be masses of confused people complaining about it on every outlet available. Windows 8 does not improve the situation.