Hi folks, So I need an audio interface and the Tascam preamps have been recommended to me. My local music store carries the Tascam US-16X08 with the newer HDDA (Hi-Def Discrete Architecture) preamps for $319, while another store has the older US-1800 on sale for $275, with older preamps. Specs on each unit's preamps are good, but the HDDA specs are very impressive - "EIN rating of -125 dBu, meaning their noise level is practically below the range of hearing. Other impressive specs include a signal-to-noise ratio of 100 dB, out-speccing anything in its price range". Anyone have a working knowledge of both of these units? Are the HDDA preamps really any better sounding?