either card will work fine,
i prefer the vt6421 though....
quiet a lot of people use this so its easier to get help if you get any problems ...
yeah mine is still shipping when I bought one I thought it wan a 6421L
VIA VT 6421L PCI SATA Card
This card is the best PCI SATA card for flashing the Samsung drive. It can also be used to “bad-flash” an MS28 without soldering.
INXGear US
ChariotDesign US
PCPartsCollection US
GoldMango US
Newegg (nonRAID version) US
This one isnt a 6421iwin2win (nonRAID version) US
iwin2win (RAID version) US
Newegg (RAID version) US
Chief Value US
Acortech US
WeGotDeals US
3BTech US
Geeks US
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taken from
http://www.360mods.net/Forums/viewtopic/t=155.html