I had a similar dilemna a few years ago...7series or 2305. At the time I was using a Craftsman GT5000. I ended up with a 2305 w/R4s, 62" MMM and a 200cx loader...I don't regret it because it can do so much more for all those little things that pop up. You may not "need" a loader, but once you have one, you will find so many uses for it. Fill the bucket with lawn debris, move sod, dirt, sand, etc. for various projects. Fill it with firewood and move it to where it's needed. Lift heavy items and load/off-load them in your vehicle...the list goes on. The loader will earn it's keep over time. I test rode the 7x series and the 2305...the ride is not so far apart...plus you get a limited
3PH for a blade or a rake...thos can be quite handy for snow, clean-up, etc. If you are considering your wife in the quation...(as I did also)...then she may find operating a little tractor quite fun vs a single function lawn mower...although the 7x is the absolute Caddilac of mowers. The 2305 loader comes on/off easily as well as the MMM. The 2305 will cost a little more and does not have 4ws or drive over deck...but heck, the 2305 cuts like a champ and the resale value on them won't depreciate as much...there's plenty of demand out there for little tractors vs Caddilac mowers.
Re: the Bolens...keep it. It's not going to fetch much, but will give you a back up mower and bagger that you can use and/or abuse until the day it dies. I kept my GT5000 and use it frequently for certain areas of my property that are tough on blades or when I feel like bagging or pulling a cart. It's worth more to keep function wise than it is in dollars. ENJOY!