Personally, in order to help you on your quest, we need to know how you plan on using it.
Will you be connecting it to an external display often or always using the built-in display?
Do you run any memory-intensive apps such as Photoshop or do you plan on editing videos, etc?
How much drive space do you need?
The Retina display is quite nice, however keep in mind that if you run apps that haven't been optimized for Retina then they won't look very good, the text won't be very clear/sharp, etc. The native resolution of the Retina is 2880x1800, so running graphics-intensive apps at that resolution may not perform very well. Running at a lower resolution results in poor image quality, IMO, just like running any display at a non-native resolution. Even the desktop, while it doesn't look like it due to scaling, is run at 2880x1800. You have to decide if display quality is more important than graphics performance.
The Retina model also lacks an optical drive, but an external drive will work just fine if you need to read or burn CDs and DVDs.
SSD upgrade options are somewhat limited and memory cannot be upgraded in the Retina, so if you order an 8GB/256GB model then you are essentially stuck with it, you cannot upgrade the memory later.
The non-Retina MBP isn't as thin or light as the Retina, it's about 25% heavier. The non-Retina comes with an optical drive, the memory and HDD can be upgraded, it has the same GPU as the Retina model, and you can get the non-Retina with a hi-res 1680x1050 display (Available as either glossy or antiglare).
I have both models, my personal mid-2012 non-Retina 15" MBP and a work-provided 15" Retina. Both have 16GB of memory, both gave 512GB SSD, both have 2.7GHz i7 CPUs (Though the Retina is an early-2013 with the new CPU). The main difference is that in my non-Retina I have a 1TB HDD in place of the optical drive, I do a bit of photo and video editing and having a single 500GB or 512GB drive was easy to fill up and I don't want to have to use an external drive to house all my stuff.
I also only use the internal display when I'm away from my desk or traveling, otherwise they're closed up and connected to an external display.
My non-Retina listed for $2650 (8GB, 1TB, hi-res antiglare)
My Retina lists for $2799
$150 more to get 16GB of memory and a 512GB SSD along with the Retina display is a no-brainer to me and if I didn't need the extra space I would happily replace my non-Retina MBP with the Retina.
I'm very happy with both but one suits my needs/use better than the other. Think about what you'll be using it for and then decide which model makes the most sense.
The only things I miss by not having a Windows PC are the games, but if I really wanted to do game then I could just install Windows with Boot Camp.
Now, if I could only get my wife off of Windows...
Good luck!