Russel, Thats a tough call..... I've owned a Beck Spyder, and currently have a CMC Speedster.... I truly loved the Spyder ( purchased turnkey in 2002 ) ..... The CMC is a restoration in progress. ( almost completed )....
First things first, find some one to give you access to a test ride / drive.....
Make a wish list....
You don't say if you plan to buy new or used..... If new, then you have to consider delivery time and individual differences between manufacturers as well as price.
If used, you need to list what you want in the car before you start shopping.... Then you can make allowances for what is available and what is not.... ALWAYS test drive the car before purchase....
Hope this helps, and "Welcome to the Madness"