Fastest Video Performance Over Remote Client

I would like to implement a very fast Windows Vista 64-bit workstation that will run a demanding AutoCAD application.  The preferred platform is MS Vista Business 64-Bit on an Intel I-7 (gaming) platform.  Using this combination of software and hardware the workstation supports 8 CPUs and up to 16GB of RAM.  I would like to share this system between multiple users but (for licensing compliance) only allow 1 concurrent user at a time.  I have confirmed that it is possible to support this scenario using the native RDP (hosting) capabilities of Vista.  Clients could connect as an administrator and control this workstation remotely accross a LAN one user at a time.

My concern is the apparent video performance bottleneck imposed by RDP client.  Is there any superior way to support the proposed scenario other than what I've outlined.  I am comfortable using VM Workstation 6.5 as well as VM ESXi but neither of these products will come even close to supporting the number of processors that a physical Vista machine is capable of supporting.  Is there any other remote client software that offers super-fast video performance over a LAN other than RDP?  Is PC Anywhere, for example, any faster?

Thanks,

Jonathan