07-11-2008, 06:10 PM
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I'll have to vote for the BC units. For the most part, many AIO tanks are similar, though some may contain additional components (like the skimmer you mentioned), or upgraded hardware (powerful stock pumps for example).
I've only used the BC units, but I will say it was a reliable setup. Now, be warned that the stock items are usually the bare minimum for that size setup to keep cost down. I have a feeling within a short period of time you'll be considering upgrading the pump, potentially the powerhead, and possibly even the lights. Conversion of the rear compartments into a refugium may be appealing to you. All in one units are popular mainly because of their modification capabilities.
Take it from me - a fellow, former all in one tank user. You may find yourself craving a better setup as your skills with saltwater keeping increase. For the money you will be investing into this unit, you could build a very respectable and probably further advanced reef setup than your all in one unit. However, if you've never kept a reef tank before then perhaps the all in one unit is your best option as it provides all the mechanics you need to keep a stable reef system.