Go for TH9. I'm assuming from your message that you've maxed out everything elixir-based (army camps, barracks, dark elixir drills, storages, gold mines, etc) and this isn't an issue of too-few builders (no free builders). If it's the latter and you have less than five builders, I suggest investing in those builder huts. I got all five early on and have kept them busy pretty much non-stop (now a mid-TH9 with walls being my only weakness).
If you've really maxed out all elixir-based projects, then yes, pull the trigger on TH9. It sounds like you play enough that you'll be keeping busy as a TH9 with all the new lab work and elixir based upgrades possible.
Bout the only word of warning I'd give is this: be prepared to lose out on a lot of TH7 loot once you hit TH9. You'll likely need to push up to Crystal III to find any decent loot. Allegedly Gold III through Gold I is good for raiding TH8's, but I've always had better luck up in C3-C2. Also, your storages should be full in the hours leading up to TH9 finishing so you can get those new structures going immediately (might as well use up the last few hours as a TH8 raiding those TH7's for what they've got, right?).
Good luck!




