Need Help Please with headgasket

[curtis]

replaced my radiator, thermostat, and waterpump and my car overheats. I was told the headgasket in the problem because the temp doesnt fluctuate when i drive, it just overheats. I am wondering where i can get the best parts, quality-wise. im not about to get an ebay kit and end up with a bunch of crap for my car. Where should i look for everything i need?
also, what kind of task am i looking at?

[shutter]

http://www.bmaparts.com/epcvsoapimc.epccookieID=1WR1030UB23516QA7D&drillid=8&subcatid=800988@@Cylinder+Head&clientid=bmaparts

I haven't done it on the m42... knock on wood.  Usually the hardest part is getting to it and/or getting it back together up top


edit:  gah, it cut off the full long URL, but BMA parts is excellent!