MOTM

I'm considering purchasing another 420 filter kit.  Right now my only 
filter is a 420.  With two of them you can get -24 dB/oct LP and HP 
responses and -12 dB/oct notch.  Also you can duplicate the filter 
section of an MS-20 by running one high pass and one low pass in 
series.  Parallel processing and stereo fx would be another bonus.

Do you think it would be better to get a different filter, say the 
490 or 440 in order to have a different character available or would 
it be more fun to have two 420s?  Can anyone also possibly provide an 
audio sample of you just noodling about with two 420s.. I'd like to 
hear what sort of stuff is possible, especially when configured like 
the Korg MS-20 setup.  Thanks for any info.
-Jim