I agree that it really depends on what you want to do. If you're interested in longer, faster rides, I'd consider a road bike. It will feel considerably different, so prepare yourself for an adjustment period.
I had a lower end bike shop hybrid (sounds similar to yours) for a while. Didn't ride it much at all (unlike you). Couldn't STAND going up hill on it. I cruised the neighborhood with the kids a bit, but never saw it as something to fully go out and get exercise on.
Back at that time, I tried riding Dh's road bike around the neighborhood and it felt so totally strange compared to the hybrid. I had a 10 speed in high school, but it seemed even more different than that and I wasn't sure it was something I wanted to try getting used to. I was nervous about clipping in and all that too (which you don't technically have to do, but you really should to get the most out of it). I really liked the idea of riding a good bike for some real exercise, but wasn't ready to commit to getting a road bike. Eventually, Dh convinced me to get a road tandem to ride with him. It wasn't long after riding the tandem that I started feeling more comfortable and excited about the idea of getting a road bike. I've only had my new road bike for about a month now and I TOTALLY love it.
As for what to expect to spend ... golly jeepers, you could spend a little or you could spend a whole lot! I'd say get as much bike as you can reasonably afford. It sounds like you'll use it. The more expensive it is, the ligher it will be and the nicer the components will be (lighter, easier to shift, less fear of the chain coming off, etc.)
My Pastor just bought a very large (he's 6'7") road bike on the internet brand new. I can't even remember the name of it because I'd never heard of it before. He paid about $675 and it was actually under 20 lbs (which is amazing for that size of a bike and that price range). It has Shimano 105 components. Not the best, but certainly not the worst. It doesn't compare to the three and four thousand dollar bikes out there, but it's ten million times better than the 1985 beast he previously had!
If you decide to go for a road bike and can convice Dh of it, start doing your research. Check out your LBS and ask lots of questions. What makes this bike more expensive than this one, etc. Then go on-line and see what you can find. My husband bought a "barely used" MTB on Ebay for $2,000, but it was worth at least $4,000 brand new (which it almost was). You may not want to spend that much, but my point is, there are deals to be had if you look around.
Another thing to consider doing. Buy the best bike you can afford for now, then slowly upgrade your components. Dh did this with his first road bike. He spent about $700 on a fairly decent used Cannondale. After he'd had it for a while, knew he loved riding, but couldn't afford the bike he REALLY wanted, he started buying Shimano Dura Ace components little by little. It was probably over the course of a year or so that he slowly upgraded it. After he had all the nice components, he bought a new frame and had all the components put onto his great new frame.
Now I have those same components on my new road bike, while he upgraded again to a whole new bike. (This time he bought it all at once.)
So, there's some food for thought. I'd like to encourage you to try a road bike. If you don't like it, you can always sell it.




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Since I bought my touring bike which has a little wider tire I have had no problems. 
So, tonight we'll see how she does! 