Yo thats actually a pretty darn nice signal chain addict. My buddy has the brick, that thing tends to sound pretty dope on most vocals. Plus u got GREAT converters...Shit, thats more than 1/2 of what ultimately makes a great signal on the way to your DAW.
Ive heard even standard workhorse mics like SM57s ran through Apogee converters and then A/B'd with the converters taken out and its amazing how much jitter those things remove - quite impressive.
-------------
Id say as far as vocals go theres always a few things to keep in mind from my experience recording MCs, Studio Musicians, & Vocalists:
1. Every vocalist is different. That goes for musicians too.
2. Due to reason (1), theres never one steadfast way to approach recording a particular artist.
3. Theres always good starting points, but remember that they are starting points rather then set parameters to live your life by.
For Example:
All mics are a little different. Sure their polar patterns might be very similar, but some sound better when theres a little proximity effect and others fucking blow the shit out of your converters as soon as the vocalist gets too close (like with most condensers vs dynamics).
So its all about experimenting - taking more then one take to get the right sound before u begin your REAL takes, and try moving things around a bit.
4. The most important thing to consider before u even bother worrying too much about your MIC of choice, your PREAMP, or your CONVERTERS (which by the way are all integral) is to make sure and use what you got correctly first before trying to fix things in the mix and say that a plugin or a magic editing method will fix the take.
Instead try DIFFERENT MIC PLACEMENTS, as well even DIFFERENT MICS if you got em. And dont forgot to watch your vocalist perform to assess whether you need to fix something along the way including how close or far they're standing from the diaphragm.
I know those things aren't the holy grail of answers but they have certainly helped me along the way and to be honest - there is NO ONE RIGHT WAY TO RECORD SOMETHING EVERY TIME if you feel me?
Hope I could contribute something...
STEEZ