Personally I went for:
10 Linemen @ 600k
1 Blitzer @ 110k
3 RR's @ 150k
9 FF @ 90k
1 Apoth @ 50k
The large amount of Linemen allow the SPP's to get spread around rather than the positional players hogging them, while the apothecary ensures (hopefully!) that the blitzer won't get killed in his first match, when generally happens
You can afford a replacement player lineman normally after the first game, or save up for your positionals which you should be able to get after game two, though you might get a thrower after game one.
I generally don't like starting with less than 3 re-rolls unless the team has a lot of skills to re-roll dice with (Humans, Orcs etc). You can actually have a high re-roll roster if you swap the blitzer to a lineman and drop the apothecary giving you 5 re-rolls, though you're asking a lot from the linemen in the first few games.
Keep in mind, 60k for a 6347 player is great value, so don't worry too much about them dying
