Build philosophy. Share your best and worst.

[Intropy]

I thought this would make a cool thread. The idea is to share the 3S-related things that have served you well, and those that have ended up being a hassle, pain in the neck, or are just generally not recommended. They can be very specific (a particular mod) or very general (an idea or philosophy). You can post more as you think of them. I'll start...

Best:

• Keeping my cars strictly "street" - on my TD05 car I kept all the important stuff. Full interior, A/C, nice stereo, etc. It took extra work, but I've thanked myself for it ever since. Life changes and sometimes all you want is a comfy car to take the girlfriend out for a cruise.
• Unsprung clutch - when I bought it, I worried it wouldn't be streetable. Totally worth it. While it can be a bit more jumpy on the street, I'm not fragging springs every time I dump it.

Worst:

• All solid mounts. Just don't do it, at least not on a street car. I'd maybe replace the front and rear, but keep the stock sides. See the first item above.
• Non-OEM body mods. While I love mixing and matching OEM parts, any aftermarket body items (everything from hoods to sunroofs to bumpers) has never fit quite right and always looked sub-par. I stay away now.

By the way, about this thread. It doesn't have to agree, and discussion is fine (you can post something the exact opposite of someone before) but try to avoid making it a debate thread. Make your point well and let others draw their own conclusions.