The SPI can be a great motor. If, IF you rebuild the head with new valve seats. I had one for over 6 years great on gas and quite as hell. I wish I would have rebuilt when I had the chance but I didn't.
If you don't go that route and wouldn't blame you go with the 2.3. But to be honest with 4 grand you'll most likly be looking at either a zetec powed sedan or a zetec powered hatch.
Price arent getting lower although the focus are getting older.
You can find a usually find a nice, clean, rust free zetec focus for around 3400 up to 6000
Sent from 34.0764° N, 118.4296° W
Do one thing every day that scares you. -Eleanor Roosevelt