when it comes to bang for your buck you are WAY better of going with the lower wattage bulbs, partly because with multiple bulbs your light is more evenly spread over your canopy which also spreads the heat making that easier to deal with, plus the cost, you can often find 4 packs of the 23 and 26watters at Lowes and Home Depot for under $10.00 and equally often you can find a $3.00 rebate bringing the price down to under $7.00 for 4 bulbs or 92watts with the 23s and 104watts with the 26s so WAY less money.
...another advantage to using multiple bulbs is that it gives you the ability to tweak the spectrum you deliver to your plants, the more balanced the light the happier the plant.
anyway, if you look around in your area you should be able to find a discount builders supply house where you can find yourself a multi-bulb bathroom vanity fixture like this one i bought for under $5.00, ...the full retail monty at Lowes or HD would be about $20.00.
...then you add the Y splitters so you can double the number of bulbs you can use in your fixture. (the splitters are available at Lowes, HD and any decent hardware store)
...that'll give you something that looks a bit like this.
...now, if you have any skills with tools and you can follow some simple wiring instructions then you could consider a better option using PLLs which are a newer form of remote ballasted CFL that, being straight rather than twisted, deliver light more efficiently and with the ballast remoted from the grow space, most of the heat is removed.
...if you need more info let me know.
good luck, bozo