Joe-

Slow down and get a grip on the situation instead of throwing out a jillion options.

First, you need to understand your personal cadence comfort range, and the kind of speeds you normally ride.

Then, go to a good gear calculator, which will help you visualize how the cog/chain wheel options will affect you. Plug in different cog/CW options until you get a combo you like.

Here's my favorite gear calculator... but there are others.

http://home.earthlink.net/~mike.sherman/shift.html

The bottom line is nobody can tell you what gearing to buy, since they don't know how strong you ride, what cadence range you are comfortable in, etc.

This is where a bike computer w/cadence is invaluable, since it provides the raw data you need to make decisions like this.

-Tom in SoCal