By German infantry do you mean Heer, Luftwaffe or
SS, as some companies don't offer them all. I'd say look at
this thread on Lead Adventure, it has a decent list.
If you have the choice go for metals over plastics any day of the week. The Warlord plastics are
GW style chunky (i.e. complete toss), and the Perry stuff is too small compared to the other ranges. Wargames Factory did do a cheap German box which was pretty good, but its
OOP.
Oh, and Artizan's Germans are hit and miss. Barring the G43s and StG-44s their guns are massive (which seeing as this is mainly a
GW forum might not be an issue, though they're not my taste). If you're doing a Winter force they and Warlord have you mostly covered though. If you're going down a Winter route I'd recommend looking at Heer 46's Kharkov range. They've some nice
SS figures in parkhas (they're what I'm using for my own force).
And a scale comparison I made a while ago, just as its already uploaded on this site:
Achtung Cthulhu, Clockwork Goblin, Warlord Games, Wargames Factory,
CP Models, Heer46, Secrets of the Third Reich - The Clockwork Goblin, Warlord Games and
CP Models miniatures are on integral bases - though the
CP models soldier is about a half head taller than most.