This is a key prepared by me for some friend.
GA -Gigabyte
E-Enhanced/revised
G-Green
P/Q/Gxx - chipset
UDx- Ultra Duarable(Usually, the letters here for motherboard line)
The x here is from 2 to 6.Higher the more stuff.
D - Durable
S - Speed (OC stuff)
L - Light/low fewer features
P - Has crossfire and Raid
R - Has Raid
Q - Quad stuff like BIOS/copper pipes
I don't think it will lack much many features.Performance will be same Unless you need RAID.
Can't you like talk with them ? I once got a 21.5k mobo for 19k.Promise that you will never ever tell and show the bill.