Hello...i'm using a pair of infinity primus tower speakers that i purchased some years ago. i'm thinking of replacing them with a pair of used paradigm studio 20v3 speakers that i can get for 639.00. i couldn't find any specific info on these exact speakers so i'm wondering if anyone has any thoughts on whether it would be a good deal and a reasonable upgrade on my current speakers. i'm using a sub now and hope to upgrade on that in a few months. i'd certainly appreciate any input.