I like the other site because I use 800x600 and this is to wide for me to see without scrolling right
Wow. I've been designing all my sites for 1024x768 ever since 2004.
Bad! Bad! Bad!
People still use small laptop screens (physically small - not resolution), so always better to cate for 800 x 600 and make page width something like 750px unless you know your target audience ALL use large screens.
You have to force change at some point or another. If Microsoft didn't stop support for Windows 98, there would be corporations still running it to this day.
The overwhelming majority at this point is running 1024x768 or above. Only when sites stop supporting 800x600 will people start to realize they either need to change their resolution or get a new screen.
In regards to the new site vs the old one, my only advice is to take a few weeks to get used to it. I myself had to get used to it awhile back.