Whats you're computer? Whats you're DAW? What type of music are you doing?
The answers to these questions will help other posters answer your questions;
Without mentioning the specifics you're going to get very general answers that might not help. It might actually make your task of finding products that fit your studio harder, because of the variation of systems out there.
If you're going with a multi-channel PCI-e card like the Lynx or the RME, this will widen your choice, as there are a multitude of AD/DA chassis out there. Depending on the style of music, and the sound your looking there are more than a few options. Me personally, I prefer the Apogee Rosetta 800, because of its musical character and vibe for the music I work on, but I would not have a problem cutting records with the Lynx Aurora. I tend to like color, so I would preferably clock it to a Big Ben, or a Antelope OCX, so as to tighten up the colorless frequency response of the Aurora.
If you need a HP jack with monitor control, why not look at FW devices, like the Apogee Ensemble [also with microphone preamps and DI's].....If you're thinking about an all in one [and running a Mac] the Ensemble is a great interface.
I'm running PC and doing some variety of styles, but will be mainly recording acoustic and electric guitar DI, along with a few different synths and roland mv-8000 drum machine. Style is mainly breakbeat/hiphop.
I've looked at the aurora but it's a bit too expensive, and I've also tried both firewire and pci cards before. I'm going hands' down with PCIe, either RME or Lynx.
As far as clock, I figured that the newer PCIe cards wouldn't have any issues with needing to be reclocked..?? not sure there.\
I see that the focusrite saffire pro can operate in stand-alone mode, so that might be a good option for me??
Rme-Multiface can do stand alone mode,flash your setting into totalmix and off you go.And it sounds better than the focusrite,+you can expand it easyly with better ad/da via adat or s/pdif.And the rme drivers are the best in the audioworld by a LONG shot!The rme clock is also very very good and responds to external clocking flawlessly without adding jitter.Check the rme tech papers to know why.