Well, only a few Model Packs are WW2 useful. Because most of them (going all the way up to MP17 and 18 and except MP8) are focused on a modern game.
-Sprite Pack 1 is a must for any game, don't care which game, any game
-Model Pack 1 contains modern entities for modern games. Though, a few segments are generic enough, so you could use those if you wish. The gib entities are a must, though.
-Model Pack 2 is another modern one, containing many useful modern things, such as dumpsters, pay-phones, sheds, signs, cameras, etc.
-Model Pack 3 is filled to the brim with industrial stuff, possible post WW2.
-Model Pack 4 contains modern entities and zombies! Though the medical entities could be WW2 surgeons and nurses, but not the Bikini Lady, if you want to be historically correct (women didn't strut around in their underwear when WW2 was going on)
-Model Pack 5 contains all very modern guns.
-Model Pack 6 contains all very modern guns, but are of much better quality.
-Model Pack 7 is a MUST! It enhances your segments and makes a game look much more less abstract/linear.
-Model Pack 8 looks Egyptian/Tomb-ish. I don't own it, so I cannot make a solid opinion.
-Model Pack 9 & 10 contain all very modern weapons but of VERY VERY good quality. Hard to match-up with MP6.
I do not own MP 11 and up so I cannot make solid opinions, so I know as much as you do about 'em. But MP17 & 18 look of good quality, so buy 'em anyways
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EDIT: Oh yes, I forgot to mention forget x9 and buy x10. It makes sure that you can have friendlies and enemies. Which is great for a good game. If you want to make a high-quality game, buy x10. Sadly, my father hates Vista and I have to stick with x9...
==MeZo
Hey mods, I liked my siggy!