If your main goal is to go fast in a straight line for less money, the 4thgen is very much the way to go. IMO, though, 5thgens are better in
nearly every other respect.
However, don't forget to consider all the things that you
didn't like about your 4thgen, it's easy to forget the bad things when all you think about is the things you miss.
I hope whatever you do makes you happy.
