5 and 6 speed manuals in Xs are rare, and come up for sale even less than rare.
Those of us with the 5 probably all envy the 6 speed version...
As for that specific E53, it is a lot of miles and even a 'one owner' car can have one or two or a few lurking time bombs once it is in a new driveway.
Otoh, there are several older E53s here with serious azz mileage and few surprises; some are well maintained, some are well maintained and lucky.
There are a few hard core cyclists too. You might see JCL's posts on his bike and carrier setup, but I seem to recall it is roof mounted. Can't remember.
NEway, great board with good info and lots of opins, on Xs, cars and nearly any topic under the sun.
Do some reading via the Search Tab and good luck on your search for an older X that won't bring you to tears, or empty your wallet.
BR, mD