Don't get the TU-510....that a pricey investment for something you'll be getting rid of in 5 years when you upgrade the printer. For perfing sheets, most likely your off-line folder has an option to install a perf wheel. If you want the TU-510 for slitting/cutting/creasing, get a Duplo 618 or similar device that will last 15+ years and not go away with your printer.
Something else to consider...when you have a complicated inline finisher like the TU-510, it will go down occasionally. This will take your whole press down so you can't print until the tech repairs the finisher.