[PD] video acquisition cards, dual streams

[jasch]

my apologies for cross-posting.
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hello,

for a very long term installation (i.e. permanent 24/7) i need to  
receive 2 streams of video on a single machine.
the video is component/analog, VGA at 25fps or thereabouts and the  
card(s) would be on the PCI-bus (PCI-X?).

my questions:

what products are there that have:
a) two analog inputs or
b) allow for 2 cards in the same machine with the same driver  
accessed twice?

do i have to
c) use two different products?

this would be on a dual Powermac G5 running either PD, softVNS,  
Jitter etc., so the drivers would have to be OS X compatible  
(Quicktime...).

i read about osprey cards (are there OS X drivers?),
i know about the imaging source boxes/cards (allows for 2 cards ?),
i've heard about the miglia alchemyTV card (allows for 2 cards? the  
website says so).

i'm gladly seeking any type of advice, ideas, products, comments,  
personal experiences, etc.
on or off-list

thank you

jasch