renegadeIXYou could look into one of the IKEA countertops, like the Karlby. Buying one of those and putting it on anything resembling a stand is a pretty popular thing to do. The 74" ones might work.
renegadeIXSo, funny that you mention Ikea because... Ikea sells counter tops for kitchens in various styles, sizes, and thickness and all solid wood at a good price. I would suggest looking there.
renegadeIXMost Lowe's hardware stores carry furniture grade wood panels in various sizes. I'm using one for my desk top now. Its a 24"x72" piece of pre sanded wood that I stained and coated with polyurethane.
I know a few people that use Ikea countertops for their desk tops.