I went with the AIO as well. I'm still in an apartment so until I'm in a house I prefer the AIO . I found a good deal on a Tunze 9004 DC skimmer here. Fits in the back nicely !So far I am really enjoying the size. It isa perfect for my little one bedroom apartment.
Having said that, after a 15 year absence from the hobby, I decided to get the AIO in order to "Keep things simple". That plan went right out the window in the first couple of weeksa, and now I wish I had a sump. Finding a suitable protein skimmer or even introducing a roller mat would be so much nicer and easier for what I want to do. Oh well... I guess I can go that route when I decide to upgrade ;0)
Having said that, the build quality of the tank and stand have been top notch so far. Other than the lack of having a sump, I am really enjoying the tank so far.