I say purely because of the extent you are going to strop up the engine go with the s13, it hardly matters if its got 200,000+ k's on the motor, its going to be an all new motor by the time your finished!
Its Cheaper too.
If you have a change of heart and get cold sweats thinking about how much it will cost for all that and want a stock motor, do what dattodude says and get a s15 one for all the reasons he said.
my 2c

Nick

98kW at the wheels stock. Looks as fast as a SR20det in a 1600.

...and it's newer.

Homer makes a good point, this donk is gonna cop the full works and jerks and the initial purchas price is $1000 or more cheaper. Whats some more good things about the S15 donk over the S13/S14..

S15..don't waste your time on anything else.

You can stop worrying about the other 6-7g you are going to spend with your current plan.

Haltech has a plug in for the STD sr20de computer
I think if you are going to do that much to it you might as well start with the cheapest option if the mods are going to require a re build,

I have driven in a 13sec toyota with a VVT-I motor and it was the bomb. The bad thing was it had a turbo. I would go for the S15 SR20 because it runs good or better than the turbo versions.

Thats awsome news. I was wandering if the old donk could be upgraded to CAS/coil packs. Is there a massive difference in heads???

s13 is the way to go then. The head is different (better ports) you def dont want VVT and if your going aftermarket ECU u can change to coil pack/CAS easily

I am planning for larger cams, quad throttle body, haltech computer, stroker kit (2.4L) and direct port nitrous - just to name a few mods HE HE HE

I think it depends if your going to leave it stock (ECU/CAMS and the like) I guess