To be fair, he's only going so low with those rims anyway - so I think all are contenders.
Galvanised are ok if you're prepared to look after them, something like Waxoil will keep the crap out of them. If you just want to go low, then comfort and price are key, adjustability is pointless..
A GOOD coilover will have been through a very lengthy development process and then preset with rates that match the car, so look for a make with good R&D and a TUV approval, basically the ones you've listed. Eibach/Koni will lean towards street settings, i.e. compliant where as KW/Weitec (and as I believe the Weitec is basically a V1 too) will be more track orientated, i.e. hard. FK I have no knowledge of, but Jonny used to run a set, so they can't be bad!
Cheap crap will most likely be a copy of one of these, but with no consideration for the spring rates, rebound settings etc.
The general consensus for a daily hack with decent handling is to go for compliant springs and hard ARBs. That way you soak up bumps easily but it doesn't roll like a ship full of custard in corners.
Mine handles really well on the Eibachs, if it didn't, they'd have been taken off in a flash. They were on the car when I bought it and I'd highly recommend them... if I was spending my money though, I'd have Bilsteins, no question. I get arch liner rub occasionally on high compression and they're not as good as they could be on the track, but my commute (which is where it does 90% of its work) is a dream.
Hope that helps somehow?