The gel batteries aren't so bad if you know their limitations. You can really only use about 15% or 20% of the power that they hold before recharging them, otherwise they wear out quite quickly. It's the same with lead acid batteries.Wish I could afford lithium batteries, but I can't just 2k on a battery compared to around £500 on a gel.
So your 200ah battery really only has about 40ah of usable power. As long as you watch your usage and never drain it too much you should get a few years out of it. And of course, you can always add more batteries at a later stage.