There are many security systems out there, I'm pretty sure it's not a problem to find something modern nowadays. For instance, I can tell you that I recently got a security system from the Ajax Systems brand, and they look really good. I'll leave a link to their website for you to check them out, and I'm sure you'll like it. All the detectors doesn't look bad at all, and I'd sure they'll suit a style of every house, so that's probably what you're looking for.

I like how modern it looks! I've been thinking of getting a security system that won't look awful inside and outside my house, and I'd get something like that.