I just bought an Alesis M-EQ 230 Graphic EQ on eBay and have been very pleased with it. It is a dual 30-band rackmount unit. I only use this to sweeten-up the incoming vocal/instrument sound, as Cubase provides my "real" eq for individual tracks, as well as the final mix.
I have an RTA/Graphic EQ in my rack and I like to watch the cool display showing all the different Frequencies as I play back a song. I don't really use it except to tweek the room EQ a bit.