My daughter was/is an "easy" baby, and I couldn't even contemplate thinking about having another child until she was around a year old...then I started entertaining the idea of when we'd TTC again. I was just so happy with her that I didn't feel the desire for another child. I was terrified of becoming pregnant again before that.. lol I think a big part of that was due to my complications I had with my first pregnancy though.
Now, I would be 100% fine with a baby if we got pregnant by surprise, but we now plan on waiting AT LEAST another year before TTC #2.
Everyone is so different when it comes to when they're ready for the next. I have friends who have spaced their kids 2 years apart, and said going from 1 to 2 was a really hard adjustment. Then I have another friend who got pregnant when her first was 6 months old and she seemed to adjust just fine.
There are benefits and downfalls to whatever decision you make. Is there a reason you'd like the kids to be closer together or further apart?
For me, I want our kids further apart because I think for me, i would better be able to balance more than once child if there was a space between them. I also love the infant stage, so I want to be able to "enjoy" that. If Audrina is in school when we have #2, I will get that chance to enjoy babyhood again. hehe.
A lot of people give me flack about spacing the kids apart (everyone has an opinion), saying that they won't have that "connection" that close-born siblings have. Personally, I was not close to any of my siblings (one 2 years younger, one 10 years younger) so I really don't put a lot of thought into the claim that kids will be close if they're born closer together.
That's all my point of view though

I think if you get to the 6-9 month mark and feel ready then, then that will be great, but if not, there's no problem in waiting!