Keep it.  Very well insulated.  Wonderful baker.  No electronics to unexpectedly quit.  I cannot wait to see the rest of the appliances--including the washer & dryer.

Keep the GE.  It's far better built than anything on the market, critical parts are still reasonably available should you need them and repairs are straightforward for yourself or a professional if need be.   This link is a GE repair manual for do-it-yourselfers that is well done and illustrated step-by-step.  I've used these GE books many times over the years.

A countertop oven may solve the need for more baking space and give you some very useful functions you'll pay thousands for in a new range.  Convection, thermal, slow cooking, proofing, etc.  The Breville is well reviewed and the Wolf is also very nice.

That's a super clean looking range, but I'm in the minority here. 

First, it's coppertone, which is a difficult shade to work with unless you're going for a rustic/country cabin look.  Coppertone is a deal-breaker for me on any vintage appliance.

Second, the range itself does nothing for me.  In August of 1990 we bought a house with a similar looking but later model GE range and it was gone by Thanksgiving (we didn't junk it; we sold it).   We replaced it with a dual fuel JennAir, and the oven on that range was the best, most even-heating for baking and roasting I've ever used.   That is by no means a recommendation for a new JennAir, though.  It's been 26 years.

If you decide to replace with a brand new range, be sure to do plenty of research on performance, and I strongly recommend you don't just buy something off the floor at Lowes or Home Depot.  It's worth the extra money to purchase from a reputable retailer that deals strictly in home appliances and employs a knowledgeable sales staff.  Don't be afraid to bring some cookware with you to see how it behaves on the various range tops.  We laughed when we saw someone doing that as we shopped for our new range, and then realized the wisdom in doing so once we were dealing with the noisy, flimsy burner grates on the JennAir.

Too bad you decided to sell it. The GE P-7 is excellent. True, it's an older design, but a very good one. I don't know about the cooktop coils, but they look in good shape as well. I doubt that range would break down any time soon, certainly not in the next two years.

Also, while coppertone is no longer a fad, I'm a fan of mixing dark and light wood tones in a decor. So I think that range would work well in a kitchen with light wood tone cabinetry. And, after all, coppertone is actually lighter in hue than the now ubiquitous black appliance tone found so frequently.  And it's warmer than the stainless look that has also been popular. And lastly, it's not that disgusting mustard yellow of the "Harvest" and "Harvest Gold" ilk.

Just my opinion. But if it were me, I'd wait until the rest of the kitchen is done before ditching the range. Plus, if you need a second oven, and you're doing a remodel anyway, a wall cabinet installation might work best.