I drive a E34 540i 6sp, manual and sport suspension, which is factory issue, which some folk call an IS. It is in my view one of the best all round cars you can get. Good honest performance, reasonable economy, cruise all day, go for a quick sprint if required, its magnificent in red, reliable as the day is long.
When I first got it I had a list as long as me arm as to the modifications I was going to do to it. A wise man from this site(true story) advised me to drive it for 6 months first, then make changes after that as and if required.
Well mate I've had the car for 3 yrs now, and all I've done, is fuelled it and serviced it..
Now listen to grandpa when I tell ya, just drive the car, make sure ya got decent tyres, make sure she's serviced to schedule, keep ya money in ya pocket to spend on ya girl friend...