I've been trying to make this decision for weeks. Wish Apple would have put the Retinal Display (RD) on the standard MacBookPro so we have the best of all Worlds. The Retinal display has slightly whiter whites and slightly sharper images and text, and the Retinal model has better sound, most notably in the mid-range.
However, have decided against the Retinal Display model. It's simply a practical decision.
Don't want to carry with me these three extra pieces:
• Thunderbolt to Ethernet adapter
• Thunderbolt to Firewire adapter
• DVD drive
Further, I want to be able to change the internal drive whenever needed, whether it's an SSD or platter drive. Also, my Mac Tech buddies tell me that the Non-retinal MacBookPro will actually support 16 GB of RAM (two 8GB strips). Apple SSD prices are high. One can get a top quality SSD 128GB for $110.
I often use target mode on another computer to connect to my Mac laptop, so if the decision were to get a RD model, that mandates the need for an accessory adapter. No thank you. If Apple made Target Mode work through USB, that would be a push toward the RD model.
I don't do games nor video editing,
So, yes, will be sacrificing some image quality and sound quality, but for absolute practical reasons, not purchasing the RD model.