With the value of E36s in Canada right now the resale value on mine is worth less the. A engine as well. As much as my wife wants me to sell it to help pay off some debt it's not really worth it. I think she wants me to sell it so I stop putting more money into it haha. I can't leave a vehicle stock. I have an insatiable desire to mod my cars. I wanna get a lift kit on my truck and 31" tires!
As for the strut brace, the way I look at is this: The strut tower brace is designed to prevent the strut towers from flexing and possible failure to make for more responsive handling in combination with a sway bar. What is the strut towers made of? Steel right? Well how can a strut bar prevent flex/movement when the bar is made of a softer material then the metal it's supposed to support? The softest metal is always the weakest link. Anything other then steel is usually for show. Their are some excellent write ups on the subject. Turner Motorsport races BMWs quite extensively so you could always email them and see what they recommend.
The Eaton blower may have stopped being made but other blowers are available. I'll have to look for it but I remember someone using the blower from a Corvette or something similar for their supercharged build. However it wasn't a 318.