Not crazy, the 06-07 of course has a bit more pep thanks to the 5-speed and vvti. I think the question is why do you want to get rid of the 2000 (rust, mechanical problem, etc). That might help inform how much more you're willing to spend on an 06+ on the same platform.
It's always the 'devil that you know vs the one you don't ' argument because an 06 is still nearly 20 years old and will need just as much baselining and maintenance as your 2000. IMO age and mileage should not be the reason for that upgrade, but the power and newer styling may justify the cost.