as much as i love fluoro's, a hps for flower is a much better idea..
unfortunately for you though, theres not really any in between, if you want the benefits of a hps, you're going to have to spring for some sort of ventilation, otherwise persist with your fluoros
this seems to be a big issue on here, people wanting the best for as cheap as possible, you still get what you pay for, if you're only willing to put 50% in, you're only going to end up with 50% of what you want.