I think could be what kind of user make with Cubase at this poit.
I'm a professional user and I work on arrangments with more than 200 tracks midi instruments and audio tracks involved, with 12 sub groups for effects, filters, I/O external effects routing with Maselec machines compressors, Urei EQ, Avalon Channlestrip, all on 48kHz 24bit and mastering operation at 96kHz 32bit floating. Cubase 6.5 works much better in 32bit mode under 10.7.5 than Cubase 7 in 64bit mode under 10.7.5 or 10.8.2. For me depends what kind of use, maybe only the mix operations could be same. Just test only with a lot of Instruments and external routing effects. I suggest to make test with Native instruments Kontakt stuff with orchestra midi tracks, multiprocessing enable on the preferences, Ozone and Tracks on the master bus. Just use a big stressing song to test better. That's my suggestions for users.
MacPro 8 cores, Macbook Pro, 16Gb Ram, 5 hds, RME fireface UFX, OsX 10.7.5, Cubase 7, Cubase 6.5.3, Native Instruments Komplete Ultimate, Izotope Plugs, PSP Plugs, IK Multimedia complete bundle, Nebula 3, MetricHalo Channelstrip, XLN Additive Drums and Keys, Spectrasonics Stylus, Omnisphere, Trillian, Eastwest Platinum Orchestra.