I'm thinking of upgrading speakers at some point to some decent bookshelves, like the Paradigm Titans, and saw some on ebay for $80 for immediate purchase. Seems like a great deal, but then I started wondering if used speakers are a wise choice. If I'm looking to build a 5.1 system and I buy one pair for my fronts, would it be weird to match them with a different set (maybe still Titans, but from a diffrent used seller)? Does it make sense to buy used speakers blind (deaf?) if you've auditioned them at a dealer? They look like series 1 Titans, btw. This may be a separate topic, but how important is speaker burn-in, and should I be concerned that used gear was not burned-in correctly? Thanks.