I spend 129k for spawn weapons:
No Deagle ammo, I start with plenty.
I buy 19 tec9 ammo and one uzi (same as 20 uzi for less buxx) total shots: 1100
15 Shotgun and one sawnoff (MORE than 16 sawnoff and for less buxx) total shots: 233
Two sniper (can't use rifle rounds in sniper rifle) total shots: 20
Three M4 (M4 ammo costs less than GayKay ammo, being that it is nearly twice as much ammo for only about 2k-3k more) total shots: 400
Of course, with the influx of noobs, so long as I don't get driven-by to hell, or in the case of Haris Pilton, parked on by a burning car that explodes after that nub gets away D: