I don't know about any of those lenses,.. and my suggestions are probably outside your budget, but consider this:
I think it would be fun to get whatever camera body YOU like, and the nifty fifty! Get the lens, UV filter and hoody at the same time. Shoot for a week (or a few days), then think about your next lens...
Fun because you will have only laid out a buck fifty over the cost of the body (how disciplined) , and you will first be constrained to position yourself to get the shot, a creative exercise of sorts, and with that fast lens, tack sharp optics and decent bokeh, the light table will be a discovery channel. The other constraint will be the narrow focal plane at certain apertures, but this is also part of it's charm... low light sensitivity is good too.
If you can then step up to an L series poke around
this site and others... $1,500. - even $1,100 can get you some great glass that will both last and retain a good resale value if you keep it mint with all the packing and receipt.
This is a walking around lens I think would be a great to have.. being lightish, and 24-105mm L series..
I'm currently hauling around this
baby (24-70 f/2.8 L), a bit heavy, but nice throughout the range, etc.. see review.
This or
this (both 70 -200) would start to round out a decent lens collection (no macro etc). I'm not sure about needing IS on this lens, but the IS version is weather sealed VS it's cheaper (possibly a hair sharper w/o IS optics) cousin (1,100 - 1,500 ish US).
Wanna try a kit lens?, look on Craig's List the things are everywhere for $300 or so.. offer $250. Some a bit more..
I'm not sure about all your questions or even how I became a lens advisor, but those links are what I'm looking at, and like I said resale is pretty good (aprx 85% for mint) so you might afford to experiment at a higher level, and recover quite a bit of your capitol should you decide the P&S was just fine.
-Shea