Unneutered male cats mark their territory. Check youtube for video clips of the big cats doing it...they back up to their post, and deliver a heck of a spray. Housecats may not have as much volume, but the spray is way more pungent than just urine. And if you wait past the proper age for neutering, he may still mark his territory even after you get him fixed, because it's become a habit.
Unless you are getting some fancy breeder / show cat, the shelters are full of cute kittens and great mature cats who all need a good home. Why risk having your cat get out and add to the population of kittens that will either grow up to a short brutal life as a feral street cat, or get dumped at a shelter when the neighbor's female has kittens, where maybe one or two might make it to a home, and the rest will be euthanized?
And if you can help it, do not have your new cat-buddy declawed. That procedure is supposed to be the equivalent of taking a pair of diagonal cutters to the first joints of all your fingers--some people say there is a lot of pain for the cat to heal up from. If you start out keeping his claws trimmed when he is little, he will be used to that, and you can keep them at a nice short length.
Good luck with your new cat-buddy! If you get one with a great personality it will be worth it, and you will wonder how you made it so long without one.
Over the years I have known many cats, and, while they were all good cats, some really stood out. One was a real practical joker and cool dude, one was more like a dog than a cat and funny as all getout, and my latest (and second one that is specifically my pet) is a mischievous little stinker who only gets cuddly in the evening. By 7 am he is back to slamming cabinet doors and knocking stuff off counters and I am usually ready to kill him, but I would not trade him for anything. Okay, maybe that is a stretch, if someone offered me a dollar right when he was making it impossible to sleep for that last bit before the alarm goes off, I sell him in a heartbeat, but I would miss the fuzzbutt.