for your budget...300E.. my '87 lasted 250,000 miles and probably had many more miles to go. It was just time for valve job and paint work....plus I had the itch for a 400E.
A very well kept and maintained 89 - 92 300E can be found in the range you are looking.
if you can stretch a bit, i highly recommend the '92 400e. your search will take a lot longer for a good one since so few were made compared to the 300e's.