I have had no trouble whatsoever with my 2000 Ultra. It is very well mannered as far as handling is concerned. After you have done a few miles together, you will have no problem with low speed turns, and heavy traffic conditions. I am not a big guy, 5'8" about 185 pounds. I was amazed at how easy the bike handles. Regarding the high speed wobble story, I don't know if it exist or not. I passed three trucks the other day in a really short straight strip of road. When I pulled back into my lane in front of the lead truck, I glanced at the speedo and I was just creeping past the century mark. I started backing off at that point, but if I hadn't looked, I never would have known I was going that fast. The bike was just as rock solid as it is at 70/75. My engine is totally stock. I have changed the factory mufflers to BUB slip on Bad Dogs. This is just my opinion, and I know MANY here will disagree. I have never understood why someone buys a touring bike, then starts with the engine performance mods. You don't need all that HP in town, and I don't think you need it at all on a bike like the Ultra. When I turn onto a freeway on ramp, I have no trouble entering traffic at 80/85 if thats what it takes, no trouble cruising at that speed all day. Now, I for one don't like to make gas stops. With a stock engine I get just what the book says I should get, 45/46 MPG. So, I can cruise at 70/75 MPH for 200 miles before I have to stop. Or, you can increase HP and cruise at the same 70/75 MPH and stop every 100 miles or so. Different strokes, different folks.
In short, congrats on the bike, you are going to love it.
LarJon