Newbie Mods Questions

I have recently started playing SH3 and am hooked. Have previously downloaded various mods including Real UBoat. Then saw Grey Wolves which looks to be real cool and am currently preparing to instal that.

The GW Read Me says GW should be installed over a clean, un-modded SH3 1.4b. I have 1.4b. Rather then reinstalling SH3, could I try installing GW over what I have and see how it goes? If no good, I could then take the clean re-install SH3/GW approach?

If I do end up starting clean, what other mods would people suggest (if any) in addition to GW? Should I re-install Real Uboat too or is it not needed if GW is there? (I like to play 100% realism).

Cheers

KC