These are 2 links I saved in my favourites.The first one is thebest,but maybe you can find more sites like this on google or yahoo.I hope it helps you.Have luck!
Caia
http://www.pcguide.com/topic.html
http://www.mysuperpc.com/
Thanks to James, I now realise the jungle of technical knowledge/difficulties I will be stepping into if I decide to take the DIY route. But My delimma is that do not have space to keep a 'Tower" unit. With the limited space I have been using the original 'desk top' which I bought some years ago. I( hve been adding on to it the HW and SF needed to modernize it. However because the Mother Board is old, I cannot add any more. So two questions arise. 1) Does any manufacturer still builds those models so that I can go for one with most modern gizmos ? 2) If I decide to take the DIY route where can I get the technical help to select the compatible parts to build a workable machine ? I will await suggestions eagerly.
Sushil

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic