When we were looking for either a 25 or 27 three years ago, the asking prices for a 27 were $50,000 to $75,000 more for comparably equipped boats. I could not justify the extra money for the slightly bigger head and slightly more storage space as compared to the classic 25. We bought the classic 25 which has a smaller cockpit, but more cabin space than the newer 25. It has worked out great for the two of us. I have modified the interior to provide more room in the v-berth so we can both sleep with our heads at the bow, which provides much easier access in and out of the berth. I reduced the width of the seats at the table to allow more aisle room. It really helps make the boat more roomy and livable for the two of us. The Wallas stove does not have a great reputation, but we like it and use it regularly. It is compact, does not require the generator to run it, does not require shore power, and no propane on board that takes up room. Works great as a heater and does not introduce moisture into the boat like propane does. It is slow to heat up. You have to adjust your cooking habits to accommodate it.
As far as access to the engine (Yanmar 125 HP), the step is removable in our boat so access to the front of the engine is acceptable. I added noise absorption insulation to the engine and generator compartments. The noise level at cruising speeds is about the same as a typical car at highway speeds. We cruise at 7-8 knots; having come from sailing, this speed works great for us. We average slightly under 2 GPH. Fuel cost is incidental to the cost of ownership. We enjoy the trip more so than the actual destination! We looked at moving to a bigger boat a few months ago, reviewed pricing and again could not justify the additional cost to step up to a 27 or Cutwater 28. I continue to modify the boat and trailer to work best for the two of us.
You will have to decide for your intended use if the 2 feet is worth the additional investment.