The best sonic match is a DSP5500HC. However incorporating one in a system raises a number of issues:

Physical size
Weight
Will your furniture handle it
Logistics

A 5000C, 5200HC and 5500HC have the same tweeter.

I always suggest for movies the biggest and baddest center presents the most impressive performance. If the above listed points are ok with you, 24/96 5500HC's tend to be pretty cheap given the performance gains.

Obviously a 5200SEHC or 5200.2 center will have a different sound than a 5000C or legacy 5200HC. A 5200SL will not sound much different (if at all) than the legacy 5200HC.

www.cmbintegrations.com
One step from the Presidency
#1 Trinnov Altitude 32-8-16, 271, 8000XE, 7200SEHC, 7200.2, Seaton F18, JL Fathom F113, Revel w990's, Kef R7, ATI 528 Amp, JVC RS4100K, SI screen. Roon Nucleus+, Eno AG, Eno M link, 218.
#2 Mark Levinson No5105, Ayre VX8 and CX8, Vandersteen Treo CT, Preamp varies.
#3 Meridian Ellipse