Milad
One thing I know about this hobby is you can buy the latest and greatest till the cows come home.
Personally right now I'd leave the LED fixtures alone until they become more affordable, yes there's alot of benifits with LEDS but it all comes at a huge up front cost.
As there is also Plasma bulbs comming out :P yes even more technology :P lol
I would do the up grade on the halides , and convert the PC's to T5's or even go with LED's as a supplemental lighting but for right now cost wise the up grade is probly the best bet
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