Its no secret I love CFL's, purely for my current grow. Not so much flourescent tubes, but more dedicated high wattage CFL bulbs, and as many as practical. You can of course grow some nice assed bud using CFL's, IF its done right and you do the maths to make sure you don't run too thin. I also like the fact they're easier to control temp wise and I'm paranoid for fires etc. Heres my current CFL grow, its a jungle:
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BUT, that said, you can only go so far with them. If you want the best kick ass weed and the highest yield you need more light, which MH/HPS can provide, of course there are pro's and con's with them too, but if you want the best possible results indoors, you need the strongest possible lighting. Growing a few plants with CFL is fine, but if you want each plant to stand a better chance of reaching its full genetic potential and yield, you need the right setup. A couple of 4' flourescent tubes will work, but don't expect big yields or anywhere near the seeds genetic potential. Especially if you're using cheap assed seeds, cheap lighting etc, good luck with your monster plant grow, I love an optimist.
My next setup will use either MH or HPS 400 or 600w purely as the top center light, and I'll use the CFL's to supplement the side lighting. Best of both worlds. Depends on your own goals, space and ability to invest cash though I guess. I'm broke, and live a pretty humble life, but as long as I can grow my own decent weed, you know what, I'm happy where I am in life, I cope alright