Cory said:
Keep in mind I don't know what I'm talking about, but I have a sense that using the best lens(es) possible and constantly improving technique are more important than the body (as long as your body's at least pretty good) and that the main benefit might be high ISO performance.
It seems to me that you know exactly what you are talking about!

Although I love talking about gear as much as the next guy, in the end, what really matters is the talent of the photograph, and not how sophisticated is his camera. For instance, most of my favorite stills where taken before the invention of AF and DSLR, so it seems that it is always possible to take great pictures without perfect AF and high frame rates.
Also, as far as "technical quality" goes, the lens matters much more than the body; for me, you are far better with an low-end body and high-end lens than the opposite. Except for ISO performance, most of the low-end body problems can be overcome by the photograph with a bit more effort, and even for ISO, it is sometime possible to find a solution to use lower ISO and keep a good exposure. Of course, everyone has his own way of taking picture, which is affected by what he is shooting; I personally uses manual focus 99.99% of the time and manual exposure 100% of the time, so I might be bias in my opinion. It is always more about choosing the camera that feels right for you than the one with the biggest numbers in the specs.