i use the metal screw type clamps. i would use clamps on everything; better safe than sorry. the clamps are cheap; look for some @ your local auto parts store. also, these are reusable (unlike zip-ties), and easy to remove / install (unlike most other clamps).
as for a fill / bleed valving system, search the watercooling forum for "Turbokeu"; lot of good info there.
click here to see pics of his setup.
also,
Swiftech has a valve system in their watercooling cases. click on product info, watercooling kits, and scroll down. it should have pics and instructions on using the fill / bleed valves.
oh, looks to be a decent setup. just remeber to post pics when youre done!