S4 HID v. H7

[Pedro Rodriguez]

Can someone please shed some light, pardon the pun, on the pros and cons
between HID systems, H7 lights, and the regular US spec lights on A4s?  I
need to buy a replacement set of headlights for a 2001 S4 and those are the
choices.  I see people retrofitting their HID systems onto european
headlights, which seems to be the best option.  I wonder if anyone out there
has gone from HID to the european fixture with the stock H7 lamps and
obtained good results.  Another option for me would be to throw in a couple
of A4 headlights.  Any preferences out there?

Thanks,

Pedro
90 CQ
01 severely bent S4