I spent a lot of time a while back looking into this, for similar reasons. So here are my thoughts on your post - it might help you.
Most importantly, watercooling systems involve pipes, water tanks, pumps = GEAR! So if you're moving your computer a lot, all this extra gear not only means weight but also added risk of damages. Coolants are usually plain distilled water so it won't damage directly, but a leak would still be a jolly good mess. If you intend to keep moving your computer around a lot, I strongly suggest that you look into other cooling methods (see below).
Secondly, most watercooling systems rely on a sort of external radiator; a heat dissipation unit that's normally mounted on top of the computer, with large holes cut into the top of the case and with one or more large fans to ensure airflow through the radiator. So almost regardless which kit you choose, there'll be a certain amount of cutting and drilling. Not for the fainthearted, and most people use a few band-aids in the process too.
Obviously, your main concerns about your current system is a) heat and b) noise, in that order, right? In order to combat the heat, you need cooling, but cooling usually means more noise so you'll lose on your second objective. Probably your best choice
would be to use a number of large fans. This has several reasons:
1) Large fans move more air. More air means more cooling. You solve your heat problem.
2) Large fans can spin slower than small fans to move the same amount of air. Less RPM means less noise. You solve your noise problem.
So how do you do this?
I would look at your current system in terms of airflow: is it too small to allow enough air and enough fans? If you don't have a medium-sized computer case (midi-tower) that's what I would get, and I would get a power supply that's much more powerful than you need so that it runs on low load and therefore itself requires little cooling and makes less noise. The computer case should have room for (and mounting holes for) a 120mm fan on the lower front, and the same on the rear below the power supply.
You should also consider buying a good CPU-cooler because the one you have might make a lot of noise by itself, but perhaps this won't be necessary. If the air surrounding the CPU is fairly cool, then the CPU-cooler doesn't need to work as hard and makes less noise because of it.
Finally, you should ensure that the cables to your disk drives (hard disk, floppy, cd/dvd) do not block the airflow; use longer cables that are easier to fold away from the central space of the case to allow the air to flow easier.
I highly recommend sites such as http://www.tomshardware.com
for their sensible reviews of computer cases, watercooling systems, and much, much more.