Silent Hunter 3, 4 or 5

KK after playing SH5 on my mates PC i wouldnt mind getting it, however its a very buggy game and Ubi say they arent planning on releasing anymore patches.

So i am wondering whether i should get one of the others, 3 or 4 seem the best choices.

I aint too bothered about arcady style games but would like around the same gameplay as SH5, massive open waters, free to plan attacks, realistic(ish?) etc. I also like the manual aiming (however i still need lots of practise)

I am however a graphics freak so it needs to look good!!

Not bothered about price, however i would be buying from steam, so SH 4 & 5 are £15 and 3 is £5 - is 3 a bargin or is 4 overpriced?

Any help would be appreciated, i have never played a subsim until i played at my mates and im in love with the game already!!!

Fast replies may mean i buy tonight

Thanks

DJRenegade