A TVR Tuscan can be as cheap as £40,000 but most people add options like larger wheels, full leather and aircon. That means that almost all Tuscans cost £45,000 or more.
You can build an Ultima GTR for under £30,000 but again it seems most people spend more like £45,000.
After three years the Tuscan will only be worth £25,000 whereas the Ultima it appears is worth more (if you can find someone to build it). If I built an Ultima though I would expect to run it for 8-10 years.
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Remind me to change my signature to something more interesting someday