I’m running a Macbook Pro Retina 2.6 GHz Intel Core i7 with 16GB Ram, and a 256 Flash HD. I wish I had upgraded my HD, so I can work off the internal drive. However, I’ve quickly gotten use to carrying around my Western Digital Passport 2TB with USB 3.0. I run the Adobe CS 5 Master Suite (usually photoshop and illustrator) while running FCP X in addition to various apps (Adium, Tweetdeck, Chrome, Safari, Word) and I can probably count the number of times on one hand the system has crashed in the last 9 months. I don’t use Protocol 10. In terms of Ram, I think the closes I’ve ever gotten to maxing out is around 10/12 GB.
In terms of the monitor, I couldn’t bring myself to spend 1K on the Apple Display (although I do love them). Instead, I purchased a Samsung SyncMaster that has a lot of controls over the display and use a Spyder device to calibrate the two.
My only issue is sometimes the audio wave timeline lags a bit when I move around a lot and have to zoom out and then back in to get the wave forms to update.