Alright, well, here's a brief overview
Pump- I would get either a MCP655 vario or a MCP355. Both are great pumps, but the MCP655 has a greater flowrate than the mcp355, while the mcp355 has better head pressure.
Radiator- Depends. Do you want your system to be loud, or somewhat silent? About how many dba can you handle?
Tubing- I would get masterkleer 7/16" tubing, or if you want colored, get primochill.
Block- Bang for the buck, Enzotech Sapphire REV. A trumps all. This little block is only 35 bucks, but is on par with the 80+ dollar heatkiller. Also, has great flowrates.
Reservoir- all up to you. You can opt out and get a t line, but its way harder to bleed. My personal favorite are the EK multioption and the Micro res from swiftech. The micro res is discrete, easy to bleed, and cheap, while the EK multioption is just marvelous in aesthetics.
For fluid, go with pure distilled water and a piece of silver in your loop. Don't get any pre-mixed stuff, since the dye in it will eventually seperate and clog up your block and other components. The piece of silver acts as a biocide, so you won't have any nasty algae building up.
As for fittings, go with all 1/2" barbs and 7/16" tubing. The slightly smaller diameter on the tubing will provide a better fit over the half inch barbs. That being said, get some bitspower fittings or danger den fatboys. They tend to have a wider OD, so the fitting will be more snug than with other 1/2" barbs.
Oh yeah, and what's your budget? Are you going to try to fit your radiator internally?