Hi Dude!
Welcome to BMW Club Malaysia! It has been already 1 year since I bought my E36 318i (1987) from a dealer for about 75K. There is a lot of difference between 1.8litre and 2.5-2.8 litre, but, what the heck... you drive fast you might be paying summon faster as well.
The car came with 17inch rims and 225 tyres. I have spent about $1500 for the M3 bodykit, CCFL Angel Eyes & HID Xenon- $1600, Engine and Gearbox maintenance - $2000 and other interior accessory for about $2000 and repairing the water and piping system for about 3-4k.
Some wear and tear has to be change, but other then that it is in great form.
Since there is so many E36 in the market, I suggest you take your time to look for a good one. Safe even more money if it is coming with sport rims and bodykit. Look at the under chasis, water tank, air-condition. I recommend to go for a 96-98 models because they are enhance model from the previous one.
After buying the car, spend some money into gearbox and engine flush to get a longer life span and better drive.
Hope that will give you some idea and tip on how to get your future car.
Cheers,
Teekay