Well, except for the processor speed (mine is 2.8 Ghz but I don't think that .01 Ghz is going to make much difference) and the amount of ram you have (I have 3 GB), your system sounds identical.....I do have an Athalon Dual-Core processor and my 9500 GT has 1 GB of video memory.
If that sounds like yours, then it should run very nicely!
I can't really answer that completely...as I haven't run the sim that much....I know it has Rotterdam, Solent (Southhampton), Marsaille, NY, Sydney, Bora Bora Islands, and the Antarctic regions plus San Francisco....I'm sure someone else will be through to fill in the ones I haven't been to yet
The only ships I've encountered is the 'Agile Solution', pilot boats, a twin hulled boat (Red Lines), there's a P&O liner in there too that I moored to in the Islands, a very large liner called 'Orient' Something, I've seen the VLCC cruising by, and I've seen the Vermaas, and I was able to get in on the 'Sigita' d/load too. I know there are many others, but can't pull them out of the memory bank just this second.
Hope this helps
Jim