It does sound (from your description) that your clutch is slipping. How many miles are on the vehicle? If your just looking for a basic replacement clutch I have purchased things off Auto Parts Warehouse | Car Parts, Truck Parts & Auto Body Parts Online - Free Shipping on most Auto before and have had success. As far as price goes they are definitely cheaper than the dealer. Man, that sucks you don't really have any tools, these transmissions are pretty easy to drop and reinstall..
As far as the vibration in the steering wheel goes. Does the steering wheel vibrate when you brake also? or just when cruising? A few things that come to mind are out of balance/chopped tires, worn tie rod end (s), bent LCA, Wheel bearing ( you would hear these usually though) etc etc...You mentioned you hit a curb? maybe you bent the rim?...If I where you I would shake down the front end and do a through visual inspection of the tires, steering, and suspension systems.