Please help me figure out which one would suit my needs.

The Samsung is the only unit with HDMI in which would be the easiest and best quality sound setup. The problem is since most or all of the systems only offer simulated surround which isn't the best for movies. For gaming, since they are all simulated surround, it isn't a big deal.

Since you don't have S/PDIF out on your computer, you would need to buy a sound card which would cost around 50 euros or more if you wanted to get a better sound card like the Sound Blaster Z. I got mine for 60.00 USD so prices vary. http://www.newegg.com/Product/Product.aspx?Item=N82E16829102048. Optical has it's problems that it can't do true/discrete surround(5.1 and above) where HDMI, display port and analog can.

But since your gpu has an HDMI out, you could get something like this http://www.lg.com/ae/audio/lg-BH7520T which has HDMI plus most/all the various surround sound decoder formats. OF course this is over your budget but you have to consider you need to buy a sound card, have a correct empty slot in your computer and etc.

Since the system above I linked has HDMI out, you can then run a cable to your computer monitor. IF you don't have a HDMI input on your monitor, a cheap HDMI to dvi adapter will work great.

SO what I would do is find something similar to the system I linked above(in your price range) and look for one that has HDMI in and if you want the various surround sound decoder formats like Dolby TrueHD and DTS-HD Master Audio. It doesn't make sense to have those sound formats with a blu ray player if they can't really be used.

be seeing you, the Prisoner...