I have been lucky enough to have owned both DSP33s and DSP3100s.

I can remember several years ago Ed Stonham giving me a long run down of why the 3100s were a major improvement on the 33s. However as I have only ever used them as side and rear effects speakers my real critical listening exposure is relatively limited.

I would mention some practical points given your location description.

Firstly the 3100s weigh considerably more than the 33s and this may well contribute to the performance enhancement but may be an issue for your shelves?!

Secondly they are much larger dimensionally then the 33s and this may be an issue in your environment.

Cinema: DSP750 x3, DSP3300 x 4, DSW.2 x 3, Trinnov A32, 271, Oppo 203, Toshiba HD-DVD, SKY Puck, Sony XW7000 PJ, Screen Research AT, Kaleidescape 4K 30TB
Lounge: 861v8, 808v6, UHD722, DSP8000SEPP, DSP7200HCSE, DSP3300, DSW x 2, 504, C15, Sony UBP-X800, SKY Puck
Bedroom: DSP5200SEHC, G65, UHD722, G08, DSW, M6, C15, 210, SKY Puck
Spare: 818v3