IMO.....if you don't have a good lens line up, that's what I would suggest focusing on. Second, if you're drooling for a full frame, a nice 1DsII would be my choice......I am a bit biased though. The past 8 years, I've almost exclusivly used 1DsII bodies to pay my bills and still do. They produce great quality image files and the autofocus is amazing even when the light is next to nothing. I sometimes work in conjunction with another studio who primarily uses 5DII's and they have even commented on how well my files hold up to manipulation as compared to theirs......of course, that could be contributed somewhat to better lighting control (which I do feel that I handle that a bit better).
In the end, I have no problem recommending the 1DsII for producing superior results in just about any situation (assuming the user knows how to make it work). And at the prices it can be had at now, it's a bargain.