Ha, 79 is no major deal. 140 is the MSRP, or manufacturer's suggested retail price. S80s are very easy to get for about 80 bucks. That being said, S80 is a great piece for those at any point in their learning. It is not to advanced for you. Next thing is, It is not a problem in any way to have a Selmer mpc with another brand sax in general. But with the small square chamber, it can some cause intontion problems on some vintage horns Also, I would suggest in general despite it being good stuff for the most part, to not buy into the selmer Hype. It is all over hyped, and the 80$ you are planning to pay for the mouthpiece is mostly for the name on a mass produced mouthpiece without the greatest quality control, but not the worst still by a long shot. Go if you are looking to get a new mouthpiece, try a Morgan. Ralph Morgan's mpcs are much cheaper, and are all handmade and tested by Ralph Morgan himself, and are great pieces. Hope this helps