Welcome to tbn - you've already found the best place on the net for compact tractor information
If I'm remembering right, John Deere has some comparision data on it's website. They at least give you MSRP for their tractors. Pricing is highly dependent on your dealer - It's not like car buying. When you narrow in on a couple tractors, post for a "price check" in the brand specific forums.
Now regarding the specs. I'm an engineer & I love specs, but the bottom line is that in the real world, you're not going to see much difference between 18 & 21 HP, 4 & 4.5 gpm hydraulics etc. You get the idea. The other tough thing is loader lifts are measured in multiple locations, at the arms, X" out, centerline of the bucket etc. Makes it difficult to compare. Bottom line - if it will lift a full bucket of dirt or stone, that's pretty much all you need, unless you have a specific requirement - pallets of sod for your landscaping business etc.
What you do want to look for is "features" - is it ergonomic, do you have good visibility, do you want a cab? Can you mount the belly mower & backhoe at the same time (not always the case). Is a quick attach (skid steer style) available on the loader?
The other thing is if it is mostly a mowing machine, you want a high horsepower to weight ratio such as the New Holland TC26DA (26HP, ~1,600#) or the Kubota B series. I'm not up on the latest Deere models.
Lastly, dealer support is more important than the color of tractor - can you get parts, are the convenient, will they service you fast.