You're seriously shortchanging your customers on memory and you're risking their data with Seagate hard drives.
My customers get to choose what goes in their computer. I haven't seen a Win7 64 system for the average uses of a computer go over 1.5GB RAM usage. My own PC has 4GB and the only time I've seen it go over 1.5GB RAM usage is when I'm playing a recent-ish 3D game. However, due to the current DDR3 prices, I suggest to customers that it makes more sense to upgrade it now as the price is unlikely to get any lower (unless Win8 needs 8GB RAM or something), and a RAM upgrade at a later date would also cost in terms of labour.
As for Seagate drives, which is the perfect drive in your opinion? In recent years I've had one Seagate desktop drive fail out of quite a lot fitted (probably as many Corsair PSUs I've fitted, given that I sometimes need to replace failed disks in PCs that I didn't build). If you've only got anecdotal evidence to throw in against Seagate, what's the point? I'm sure there'll be as many people on this forum who swear by Seagate as those who swear at Seagate
As far as I can think, I've replaced... 3 Seagate drives that I purchased. I started business in 2004. I would guess that I've bought probably 100 - 120 in that time (though admittedly a customer could have had a drive installed by me that then failed and took it to someone else). For a long time I was replacing loads of Western Digital drives, but then Seagate drive replacements became a lot more common because.... Packard Bell and quite a few other OEMs switched to Seagate. I had something against WD for a long time largely based on anecdotal evidence. Looking over the 500GB Caviar Black, I might offer it as an option for customers who are potentially interested in a drive with a longer warranty.
If you want quiet and good quality, there's no better brand than Seasonic, the company that was actually making those VX450s that you were buying. Their S12II series is what I think you want.
Yes, I know. However from the prices I'm seeing, their S12II-430 is the same price as the VX450W and has two years' less warranty. I would consider it if that is exactly the same hardware as the VX450W, but I'm fairly sure the VX450W had 1x 12V rail, as does the CX430.
I'll try to find some reviews of the Antec EarthWatt range and Seasonic's PSUs, thanks for the input.