Best place to buy?

Yeasterday i made a post about my plans to upgrade. I would like to thank Rob and the other guy for their replys. Answering Rob's question, my current configurantion is:

CPU - Celeron 300A
Motherboard - Gigabyte 6BX
RAM - 128 Mb 100 Mhz
Graphics Card - Riva TNT 16 Mb
Sound Card - Creative Sound Bastler 16 bits
Hard Drive - Quantum 5Gb UDMA 33
Case - Mid Tower ATX Enlight with 230W power supply
Cd Drive - Old Cd Rom Drive, maybe 20x
Monitor - 17" Samtron (best thing that i have)
Modem - 2 analogic modems (33K and 56K) - looking for cable
Other - 2 stereo speakers

I'm trying a shot at building my own computer, but i don't like prices here in Portugal, so i would like some help about links where i can buy in Europe or America, that make international shipments and acept Visa payments.

As i said in my last post, i'm thinking in a AMD Athlon XP because it's more afordable then PIV. I thought that buying a retail box would be a good choice to avoid cooling problems.
My choice in motherboard would be one with new chipset Via KT266A (great reviews), but i've heard that could be compabilitie problems. :-(
Well i definetely need a new power supply (300W or 350W), but i think my case is good, should i get another heatsink for the bottom front of my case too?
For memory i would like DDR2100, but i don't know about the brand, i've heard great things of Kingston, but it's costy too, there is Crucial also, but i don't know if they deliver in Portugal...
Maybe i should get a new graphics card (Geforce2 to be more cheap) and a new hard drive (20 Gb UDMA 100 - 7200 rpm - 2Mb cache).

Thanks to all for you help.

Have a good Weekend.


Nuno Amaral