Its worth it, its not that expensive anymore, and you can get an used one anyway.
I am primary into pc gaming, or more precisely computer gaming, as ill always consider the amiga as a superior platform
. But things are evolving, most of the best of the year pc games are just xbox360 ports without using any of the machine specifics, just have to look at skyrim, you even have to use mods to improve your perfs. Its even worse for ps3 games, lot of them are not adapted.
All the titles you mention are very well worth playing, valkyria profile turned out to be much more strategic and deep that i was expecting. Dont be fooled by the anime graphics, theres plenty of features i only find in games the like of jagged alliance, cover, use of terrain, companion interactions affecting their stats, really an excellent surprise.Dark souls already said it, is in my opinion the best title of this year, over skyrim and witcher2.
You should also try the non rpg exclusive, while you are at it, now you can find them around 20 euros or so, god of war 3, uncharted are really spectacular.
I am also testing Jrpgs, and frankly they arent more linear or as dumbed down as a mass effect game.
There's hardly anything to cover on pc anymore for 2012, i dont feel excited by the worthplaying list .Its the ground of mmorpg , probably not for long consoles can do it too , some rts (ruse sequel ) , maybe x-rebirth,the new elyseum ((by dominion 3 makers)a few mediocre indies and thats about all.Oh yes diablo 3, and thats just an hack and slash.