For those of you who are Californians, you will get hit by a state use tax on your sr20 purchase, something like 7.5%. Considering the sr20’s price, this is roughly equivalent to the cost of an installed GNS430 at a premium avionics shop! The (looters?) at the State Board of Equalization are relentless and sooner or later they will track you and your plane down, even if you registered it out of state or under a corporate name. The best time to make arrangements is BEFORE the actual purchase (too bad for me, but there is still hope).
I found the following firm to be very helpful to me for my 260se/stol purchase:
Associated Sales Tax Consultants
I spoke with Tom Alston