That reminds me of the first time I used ISS forums. I bought some dunks and the seller wanted me to send the money to him as a gift. After I sent the money, the seller stopped responding for a week. I thought my money (100) had disappeared. I also learned that paypal wont do anything...
335i, with a chip you will exceed acceleration performance of the m3. Depends if you want to go to the track. I think an e36 m3 with suspension and engine mods will outperform an e46 m3 on the track because it is lighter.
E46 BMW are known for cooling problems. If the engine hits the red it will usually mean bent rods etc. (aka new engine) With 100k the car is basically totaled. Time to get an M3 engine swapped in.