MPC Renaissance - Has anyone upgraded their sound card?

I've just built a new Windows 7 64-bit machine and am using the Ren's ASIO driver for the output in the MPC software. I currently only have an on-board sound card for the computer's audio output. Would there be any point in installing a new sound card for use with the Ren? Would this possibly improve any audio performance with the Ren? If so, does anyone have any suggested sound cards to use?

This question is purely concerned with performance and stability with the Ren and MPC software. I do use Ableton, but I have a Steinberg UR22 interface that I'll be using with it. I don't want to use the Steinberg with the Ren, because I like using the vintage mode buttons and the volume knobs on the Ren.

Note that I'm not having any latency/distortion issues with the Ren (yet), but I wanted to maximize my performance and stability if possible.

The ren driver is actually pretty damn good.. I'm running a macbook pro 13inch dual core i7 (early 2011) with 8gb ram..

I use the ren live at 64 buffers as a plugin inside of reaper.. It's runs streaming audio plus a click channel plus a master limiter, side chain comp on the streaming audio channel and i pad bash live... No hiccups..

Is the machine you built brand new?

Yep, brand new motherboard, HDD, CPU, and RAM. Currently it's using Realtek drivers for the on-board sound card. Really all I wanted to do is maximize my sound quality while remaining stable. If there are recommended sound cards out there to use with the Ren and Windows 7 64-bit, I'd be willing to make the investment.