Hey Luca. I'm new around here but in researching for my own upcoming project I did run across an answer for you on your questions. To my untrained eye it appears that you are set.
As for the VCR, with a quick search (I'm on the NTSC side, not PAL) it is comparable to the Panasonic AG-1980. That's a great thing if it is in full working order.
The external TBC comes highly rated as well.
As for the capture setup; I gleaned a lot of information from this forum thread if you have yet to see it.
http://www.digitalfaq.com/forum/vide...der-hacks.html
Specifically post #35 had a few answers for you.
"You have to use
Windows XP x86 (32-bit). No x64, no Vista, no Windows 7. If available,
I suggest using Windows XP Pro SP2. Not SP1, not SP3. Not Home, not Media Center Edition (MCE). Windows XP Pro SP2 is the most stable version of Windows XP.
(SP3 is also stable, but adds a bunch of online "security" crap that's not really essential to a system built for video capturing. You'll have to disable most of it, if you do use SP3. Otherwise it may tank a capture with silly warnings and nuisance pop-up alerts.)"
As for the drivers I'm sure you'll get most of the answer you seek in that thread I linked. Good luck and happy capturing!