Hey Tim,
There should be some 914s &/or 914 owners at the upcoming PCA Zone 8 Cal Inland Region's Concours on 4/30 8-2 at College of the Canyons in Santa Clarita, near Tragic Mountain - which isn't too far from you in Thousand Jokes.
Good way to see 914s & talk with other owners, & maybe bum a ride or drive in one. Some of the CAI folks should know the shops up north close to you, but there are some down here near me in OC.
Who knows, maybe there will be a nice 914 FS there if fate has it!?
I'll be there judging, but not with my 914 which is under a slooow resto, so ask around or look for my blue 88 VW Westy serving as the refreshments/registration/scoring set-up under the awning.
As others have said - find the best one you can, & you should think about whether you want a stock 914 in 4 or 6 flavor - & on the /4's whether you want a 73-74 "GA" 2.0L & the 74 LE Trim variant, or 75-76 "GC" 2.0 (with the noted smog requirement on 76) or a more basic 70-72 1.7L (73 1.7s in CA were detuned to 69 HP so tend to be a bit doggy & conversion fodder) or 74-75 1.8L flavors - or more of a custom 914 resto-mod hot rod 6-conversion/Subie/V8/etc.
If you see yourself happy with a classic look & driving experience of a a 356 coupe, cab or Speedster, or a 912 for the fun driving experience, then even the 1.7 & 1.8 will fill your need.
Don't look for nor compare any classic period Porsche including 914s to your modern Cayman S, since the power-to-weight is completely different, as is the driving experience.
Forget the numbers & bench racing comparisons, but instead compare the driving experience. Many have said it is more fun & thrills to drive a lesser powered car at it's limits, than to drive the modern power beasts at 70-80% or less of their capability.
I'm sure you're not using anywhere near 100% of your Cayman S on Mulholland, but you'll be close to full use of a 914 with all the thrills - IF you don';t get ticketed first!
As you do your research, in addition to the posts & info section on here, you should also look through p914, & Jeff Bowlsby's 914 website's & use his 914 PPI form on any cars:
p914.com (& .net & .org)
Assessment:
http://bowlsby.net/914/Classic/zTN_Gen_914CAF.pdfAll 914s Info -
http://bowlsby.net/914/Classic/74 914-2.0 LE Info -
http://bowlsby.net/914/CanAm/ Cheers!
Tom
///////