I'm a Mrs Freak on a Leash. Don't you like Korn?

That sounds GREAT! You are pretty much on the same path as I am...shedding weight, new hairdo and yeah, I dropped a bundle on some spring clothes, which I'm lovin'! But this isn't cutting it for you?
I think you are suffering from the "grass is greener" syndrome. You might be overthinking it. I think it's a good thing to have dated around before marrying but many do as you do and fall in love and marry their first. As long as things are good between you then you aren't missing anything. The dating scene usually pretty much stinks. Do a google search and read some horror stories about it.
What you might be needing to do with two young kids is to look hard at what you and your husband are doing together. You might need to build some excitement back in your marriage. I pretty much am aware of where you are at because I was in exactly the same place at your age and that's when my "mid-life crisis" hit..at about age 35. 10 years later with my kids 15 and 12 it's a whole different world. I love being able to get out of the house sans children. My husband and I enjoy a lot of activities together (kayaking, hanging out, dinner, bars, concerts, etc, etc).
You might want to try and get a sitter and get out if you aren't doing so already or at least schedule some "alone time". With two young kids my bet is that you aren't getting much.
I think you should concentrate on working to improve and inject some excitement into your marriage instead of wondering what being with another guy is like.
You might also want to look into getting into a hobby yourself. Sounds like you are into lifting weights so that's a good thing. I am into kayaking, camping, skiing and wheeling in my Jeep and before that I raced cars and did a bunch of traveling. Yeah, I'm a bit crazy.

But it helped me get through this same crazy phrase that many of us middle aged people go through.
Good luck!