Hmm, SH4 vanilla...
The days when we still thought of the enemy as people with families and dreams. But now, we think of them merely as targets.
Really dude, make any effort possible to get Uboat addon and then try out one of the Mega Mods. And when you decided that you want more (if GWX doesn't come up untill then) get a copy of SH3, put GWX3+OLCgui+ACM on it and start praying. As a brit, you'll get a warm and fuzzy feeling as those british depth charges fall on your hat every time and knowing that the british were the nemesis of your Jerry boat.