MR-S/MR2 Spyder with a 2zz engine swap and 6spd manual. Then s/c or turbo it.
Will be sub 1000kgs with easy 300whp on stock engine internals. Or built engine and run anywhere upto 600whp.
Would be cheap cheap to buy one used with high kms, engine swaps easily available from monekywrech.com and it would be a weapon. Check out spyderchat.com for lots more info. Lots of suspension parts available. You could build an amazing track car.