Sonar X2 and G-Player on the same 64x machine...

Hi list,
I'm a Sonar dinosaure user so far..
I'm still using XP pro on 2 separate P4 machines (PC1: old Sonar v7 driving Gigastudio installed on PC2 )
I always used 2 separate PC's because of lack of power to run both
applications on the same PC.
Both PC's are communicating using MidiOverLAn and PC2's audio card feeds
PC1's audio card using SPDIF connector. So in Sonar all is mixed inside PC1.
So far so good. Ok.
Now I'm thinking of upgrading for a new Win 7 PC and Sonar X2 version 64x.
Since Gigastudio is obsolete I'd use G-Player which is
a 64bits sampler replacement for it.
I don't know what would be a GOOD choice for a powerfull
Win7 64x DAW.
I read the Dell XPS 8500 specs using a i7 uP with around 16gigs RAM,
2 terabytes drive installed, etc...
Any DAW suggestions welcomed here..
My question is:
With such a DAW would I be able to run BOTH Sonar X2 and G-Player applications
on the same machine without any audio latency issues ?
I'd be using a good firewire Echo Audio card (Audiofire12).
Thanks