CFL lighting Color Temp

Which is better to use for starting a grow from seedling and veg state till I get to flowering? 4100k 5000k 6400k?
I will be using a 600 hps for flowering

I did some pricing as well:

30 Watt Compact Fluorescents

30 watts for 4.35

OR

CFL, Compact Fluorescent 23w Super Mini Twist Light Bulb

23 watt for 1.95

Would I be better off buying more 23 watts for less? Or spending the extra money but get less 30 watt lights?