I decided to spend over 5k on my ZHP a few weeks ago to do a large amount of refreshing. Suspension, Drivetrain mounts, lost of maintenance, etc. Feels like a much, much newer car now and I do not have a desire to buy a new car anymore, especially with the way the market is right now. Money well spent in my eyes!
If you have not refreshed the suspension and engine/differential mounts yet, I highly recommend it. I feel like I took 10 years off the life of my car! (I see you have not done the differential mount yet)
2005 BMW 330i ZHP 6MT. Built 11-19-04. Bought 4-2012.
Stock: Nav, leather, PDC, Xenon
Added by me: OEM Alarm, OEM heated seats, OEM aux kit, OEM Bluetooth, intravee, M3 strut brace, BMW Performance Intake, Nappa leather arm rest, updated LCM (triple blink, euro hazards, trifecta lighting, 3 stage brakes), temp gauge