I've had a Bianchi for 11+ years now. I have replaced some components on the bike over the years of course, but the frame is solid. I paid 350 bucks for it when I bought it. It's has no suspension, and I used to use it pretty hard in the woods. It's been turned into a "city bike" now, with smoother tires, headlight, full fenders, etc. I now ride it to work daily except when there is snow or ice on the roads. Point is... I can't kill it.
Look at Bianchi. You'll be pleased. Good luck!