well, tough call. i would go spectrum over watts as watts doesn't always translate into lumens the way most think. If I was you I would go with a single Feliz T5 300 watt 6100K bulb for veg and use whatever else you have to flower.
I have done DIY's for 2 magazines and tons of sites. Hell even sunlight supply made a aircooled 150 watt light after they saw mine
so if you need any help just let me know, we're always down. Now that I think about it I might have even been banned from this site way back in the day for giving away free grow equipment to some local AZ growers, hmmmnnnn...
I might even have a light or two you could borrow till your on your feet. Don't think I have a 600 though, more than likely just 1000's and Feliz T5's