We are talking QTVR here. Not a normal Quicktime movie.
I say wait awhile longer.
I have an Intel Q6700 Quad Core 2.67GHz running 4GB ram 2x 10,000RPM Raptor hard drives and I must say I've never really been happy with it. 32 Bit.
Be warned 64 Bit PC's will not run Quicktime (if that is important to you!) There is a work around but regular customers will never follow this pattern. Apple needs to pull it's finger out.
My old AMD 64 Athlon is only slightly slower.
Better must be on the horizon you would think.