Hey Mark,
First off hang in there and let go of the frustration, that will only make it harder to get it. Its very similar to riding a bike...remember back when...? Once you get the feeling you can surf any wake or ride any board!
It looks like you are a lil far back on the wake so pull yourself closer, but only inch by inch till you "feel" the wake driving you. If you start high on the wake and then ride down (heel side) you should feel the drive. Just dont get too far away from the wake so you can stay in the area of the "spot" Work up on down, right to left with the rope in hand and after a little time you will "feel" the drive and the rope will go slack.
Once you get it, you will go "Ahhh Haaaa, I get it now..." So relax, smile, and enjoy the process. Next you will be asking, how to I spin & get air. So be patient and just work the wake with the board till you "feel" it.
As far as the board goes, if you can find a Blue Lake by Inland Surfer grab it! They are hard to come by as there new '08 line has not come out yet. I really like Matt at
www.lakeeffectsupply.com Call him 414-217-6725, and he will be a great support to you. He carries Inland Surfer, and many others that may help you progress.
Here are 2 pics that show the wake pushing while holding the rope:
Best wishes,
Jason