Seeing other guys with multiple sets makes me feel a little better. I've been on a tear lately, finding some older sets for dirt cheap at Golf Galaxy
Mizuno MX-23 3-pw with Dynalite Gold S300s
Taylormade R7 4-GW with TT Black Gold Stiff
Nike VRS_Forged 4-GW with Nippon 950 Pro HT Stiff
Cleveland CG16 Tour 3-SW with TT Dynamic Gold S300
Ping i5 3-PW with ZZ65s
Adams CB2 6-GW with TT Dynamic Gold S300
I don't have too much of an issue swapping between them so far, most except the Nike are D1-D2 weight so they feel similar. The CG16 are noticeably shorter then the others with more traditional lofts, but others are about the same.