I just got my KBB trade in value on my 99 SVT T-Red w/ 50K miles and listed it at Good shape. Came back at $7,200. Private Party around $8,500 and dealer retail around $9,500.
Keep an eye out on the AutoTrader.com site as well call the SVT dealers in the bay area as I routinely see/hear about SVT's on the used lots. If you tell em your looking they will definitely get back to you.
These guys posting are obviously being sarcastic as there prices are well above dealer retail even with the mods they listed.
Best of luck out!