I want some 4G over WiMax

A straight answer, finally. WiMax just carries the signal to your cell phone, PC, Pad, etc. (much like WiFi wireless in your home). 4G is just a list of billable services that run over WiMax. Steve

"WiMax is a specific approach to transmitting data wirelessly, as outlined in the Institute of Electrical and Electronics Engineers' (IEEE) 802.16-2005 standards. 4G, on the other hand, is a description of what a network with that label must be able to do. The criteria include data throughput levels, roaming and end-to-end use of Internet protocol."
4G, WiMax, Web 2.0: Animal, Mineral or Vegetable? | Blogs | ITBusinessEdge.com:

WiMax can provide broadband wireless access for up to 30 miles for fixed stations and 3 to 10 miles for mobile stations.

  WiMAX Equipment,Wimax Products, Mobile WiMAX, WiMax Technology and Sevices 1-877-259-4629

And now for some WiMax Enabled PCs out of the box:

Toshiba's 13.3-inch Portege R700 gets a pair of WiMAX models -- Engadget