Go to best buy or staples and check out the keyboards they have in stock, try them out and see which one you like best. Personally i cant stand to use the ergonomic split keyboards but i know many people who like them. Unless the keyboard has free shipping dont buy it from newegg as the shipping will probably cost you almost as much as the keyboard.
Good advice there.
I use the microsoft ergonomic 4000. I like the zoom key in the middle and the page fwd/back keys.. I think you can learn to like the 5 programmable function keys in the middle.
Microsoft support is very good. I had a sticking "Q" key and they replaced the keyboard w/o exchange under warranty, no questions asked.