Faster processor or more RAM?

I'm looking at moving from PC to an iMac and was wondering which might be more beneficial in running Lightroom, a faster processor or more RAM? One machine I'm considering would have a 3.06 GHz processor with 8 gigs of RAM, the other a 3.2 GHz processor with 4 gigs of RAM.

Thanks in advance for any advice/suggestions.

The difference in processor speed is unimportant compared to the performance boost with 8Gb of RAM. Get the largest internal hard drive you can, too.

Being a PC guy, I don't know about iMac;s; but, if possible, get a video card with a faster GPU than standard. That, coupled with 8GB of Ram should make for faster writes to the screen.

Another advantage of more RAM (and a faster GPU, if you can get it) is that if you decide to add Photoshop to your software bag, you'll be happier.

--P

The computer experts always recommend more RAM as the cheapest and fastest speed boost and my personal experience agrees. With limited RAM you spend a lot of time swapping info from your hard drive into RAM (slow). Unless you're doing extremely heavy duty processing in PS (like routinely stitching panoramas) you'll never notice the difference between 3.06 and 3.2 GHz. If money is no object, then Preston's suggestion of a faster video card with more video RAM will also produce more noticeable speed increases than a faster processor. Of course, Apple bundles more video RAM with their faster processor, so you may not be able to separate the two items.

Mark

On top of what others have said, the pricing alone makes it hard NOT to recommend more RAM these days. When a 4GB stick costs only $20 more than a 2GB stick, we see almost all our systems going out the door with 8GB or more now.