You're right about that 1.4 Thunderbird... it has always been the hottest!
Any Socket 'A' CPU cooler that will fit on your mobo will work. It's only the space around your CPU socket that will limit the size of HS/F that you can put on there.
Try to get one that at least has a 'copper core' if not solid copper.
You'll also want to use a good quality Thermal Interface Material (TIM) like Arctic Silver V.
Here is my new PCChips M848A' ">http://img.photobucket.com/alb...2_T-2-3-3-6-2_M848.jpg v2.1, with a 1700+ @ 2411 MHz, and my trusty old PCChips M810L' ">http://members.lycos.co.uk/mmm...00MHz_Sandra_tests.jpg v7.1A, with a Barton 2500+ @ over 3500+. Some of my fancy cars are on this pag