Advice needed

[[501]Otto]

Hi gents:
Just wondering if you can give me some advice about this.
I´m looking to get SH IV here:
http://www.amazon.co.uk/Silent-Hunte...9221425&sr=1-2
and I have some questions, that surely have been answered in this forum (I have played SH III+GWX, and now I play SH V but would like to sail the pacific) :
1-Does it worth to buy it?
2-Is it the complete game?
3-In case all above are affirmative....which mods should I download and install? You know, eye candy but also those ones that make it realistic....
4-last but not least....does it work with Windows 7 x64?
These are my computer specs:
CPU Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 MHz
NVIDIA GeForce GTX 285
Ram 4 GB´s
Windows 7 Ultimate 64

As SH V runs smoothly on this, I think that there will be no problem with SH IV, but...who knows?
Thx in advance, greets from Spain:
Otto