Bluetooth and RAM

Hello to the Mac Family!

I have a couple of questions:

1) Does anyone know of a decent pair of bluetooth headphones that won't kill my wallet?

2) I just upgraded to a gig of ram for my iMac G5 1.8ghz. I previously had 512mb... will I notice much difference in the way the computer operates? I am going to be doing some video editing and I already work a lot with photoshop.

Thanks for your comments!