With 4.5k as a budget i would recommend getting a rs1800 the turbo is by far a more costly longterm option.

the rs1800 shares all the charecteristics as the turbo but the engine is stronger.
If your not to overlay bothered if the car is to concours standards in looks then a good exmaple can be picked up for 1k. then along with a nice set of 15s and good sticky tyres your set for a good gripping handling car along with a set of gaz coilovers, avo are an option but to be honest the finish quality etc is not up to scratch in my opinion.

With a stock zetec 1800 chipped ecu cam your going to see a good bhp figure for your money and it will be 100% reliable and take all the stick you give it.

Brakes wise, the rear drums are effective just a better set of calipers up front. options are endless with this.. stick with ford calipers of a larger sized car or go the willwood route.
Cage will stiffen things slightly and give you that added bonus of some saftety etc...

Have a lil look in fast ford Jan issue in the fiesta tuning guide for some more hints tips etc..

Out of your choice of cars the only on that really stands out as a track car is the 205 or fiesta for me...... ive had experiences with both and id stick with the fiesta personly..

Best mod of all is the quaife diff for sure transfornms the handling no end.
With regard the transmision the rs1800 comes with better ratio gears than the turbo and a stronger casing gear box due to larger bearing.


RS1800