i already have the nsp1 set. however, i cant help myself but want to upgrade, and i was looking at either the n26 or n28 bookshelf speakers. a couple questions: 1) are either of these a useful upgrade, as they will be used for music and HT? 2) Is the n28 better than the n26, especially when blending with the other speakers (n24s and N-center, duh...) i have? 3) would it be better to buy either the n26s or the n28s, use them for music, and use the matched n24s all around for HT?