James,
I will assume you read the locked thread at the top of the Newbie section. Read it several times. I will risk wrath from some here by saying you should not trade the Lexus for a Speedster. Having one each makes a lot of sense however, as this is basically my arrangement. The Speedster is a toy, and a very cool one at that, but I do also have a real car: '03 Mazda 6. Some use their Speedsters as daily drivers and it can be done. Most of them live in CA. Regardless of your clime, you will give up a lot of creature comfort for the fun involved.
Getting a new turn-key car is going to be in the $30K range from most builders. If you want the "Lexus" version, go put a few large down with Henri at IM and get a truly magnificent build w/ roll-up windows and a good heater for probably well over twice that amount. Or buy used ($10-15K -?-) w/ idea to get a real good exposure to what these cars are about and how you work w/ them. Drive it for a year, and if all goes well, you'll then be the ultimate informed consumer. "Staff" here can help you find a good used car. You would be able to sell the used one for about what you paid for it, depending on if you fixed or upgraded it -- or maybe drove it into the weeds -- LOL.
I'm not saying don't buy, because I'd love to see you in a Speedster, just don't give up the Lexus in order to do so.
And above all else: come to the Carlisle meet in Carlisle PA this spring, and see and meet many of the cars/drivers from this site.