Welcome to R2R! It's a great community with really nice people
Don't forget AIO's are usually marketed with total water volume, not display volume. So a 10g AIO might actually be closer to 6g because of the 4g volume of water in the filtration area. Not sure what specifics you are looking at but something to keep in mind. I previously had a Nuvo 30L which is 30 total gallons, but only about 22 useable gallons in the display. I very quickly upgraded to a Reefer 525XL (110g display, 140g total). Not saying that will happen to you but make sure you're aware of the actual display tank's volume
And I second everyone else here that you should start with a bigger tank. It can be really hard to keep little tanks running smoothly (it's keeping me out of starting a nano tbh) but my 30g tank was a breeze.
Thanks for the thoughts. This is were I am stumped. I would like to get into Salt, but don't want to drop a grand to start. That's the the LFS owner told me it would cost. Not including fish. I am also having trouble convincing the wife to allow another large tank. I have 7 running FW now.
Derek