I think it depends a bit on how you will be using the boat, and you didn't tell us much about your current situation--where you will be sailing, whether on your own or with family members (how many?), whether day sailing or for a week or more at a time. I understand that with this being your first boat, you may not know how you will use it over time, but nevertheless, that's important information.
Based on my (limited) experience with Ericson 27, they are a very solid and safe boat, but not among the fastest, especially in lighter air. If you are mainly wanting to be on the water and speed doesn't matter much, then it may be a great boat for you; otherwise, you may find it a bit frustrating if you are expecting more speed (or planning to enter local races at some point). One of my earlier boats was a San Juan 23, and it was significantly faster than the Ericson 27 on our lake in light air. You could determine whether it suits you by asking the current owner to take you sailing one or more times, preferably in different wind conditions, so you could see how it sails. You may just fall in love with it!
We have been very pleased with our Ericson 30+, though it's a bit different in several ways from the E27, and the support on this website is superb! You will get lots of helpful advice on any questions you ask.
Good luck with your decision!
Frank.