Modular Power Supply for system with Radeon X1950 AGP

First of all - how much power will I need for a system of my spec, with a Radeon X1950 AGP card? I know that sapphire's model needs two molex connectors for power so my 500W wont be enough especially considering how many drives I have in my system. My current one is a cheap Jeantek 500w power supply which has a huge bunch of connectors all take up valuable breathing room.

Basically I just need to power two or maybe three SATA drives, one floppy drive, Audigy 2 ZS Platinum drive bay, two DVD Optical drives and one ATA Hard Disk, one 120mm case fan, and a Radeon X1950 AGP Card (which alone requires two molex connectors). See the spec in my signature

Secondly, which brand would be best for Modular Power Supplies?

Seasonic
Enermax
Corsair
OCZ
Zalman

I have had my eyes on Seasonic due to its low price but I know that Zalman make some nice silent products which would help in my kind of PC. I have also heard that Enermax and OCZ to some extent are big names in Power Supplies.

Could people please share their experiences on the above companies and help me in making my decision.