The UK300's are excellent lights. They use Hella globes. A great option is a pair of Cibie driving lights to replace the factory fogs.
The best source you will find anywhere on lighting is Daniel Stern
Sent him an e-mail he can give you all kinds of options.
FWIW he wrote an article that included information on aftermarket HID kits. To sumarize his findings, after market HID's cause huge glare problems for other drivers because the optic requirements for a halogen and hid lighting source are very different. When you stick a HID source into a globe designed for a halogen bulb the beam pattern may work nicely for the driver but you are likely blinding other road users!!!