I have an LA610 which is the same 610 pre but with la2a style comp instead of 1176.
The preamp has very little headroom, making it easy to clip.
If a singer has bad (or no) mic technique you will find it very hard to set level (in my experience.)
Awesome for bass or drum room mics though.
I recently got a pair of Don Classics NV73 neve 1073 clones and run them into my Drawmer 1968me.
This gives me beautiful neve saturation with lots of headroom and then valve compression to follow.
I am extremely happy with this setup and I have 2 channels of this chain for about the price of the 6176.
I don't know what country you are in but 6176 on Thomann £1945.
http://www.thomann.de/gb/universal_audio_6176.htm
Don NV73 £499
http://www.thedonclassics.com/nv73.html
Fredenstein Bento 2 £162
http://www.thomann.de/gb/fredenstein_bento_2.htm
Dramwer 1968me £1029
http://www.thomann.de/gb/drawmer_1968.htm
The NV73 into the 1968me is amazing, and I am also sending mixes through the line in of the NV73 into the Drawmer which is a brilliant bus compressor that plugins cant get close to.
The Drawmer can be used as dual mono and is great for tracking or linked stereo on the bus.
http://www.soundonsound.com/sos/dec04/articles/drawmer1968.htm
If you want to send me a raw stereo mix wav, I can run it through the line in of the neve and through the drawmer and back in through Apogee converters.
You should be able to hear the character that this chain gives to the mix.