As mentioned by Xenonman and Gonk, the efficiency of your speakers will play a big part in your amp decision. But another factor is the common habit of upgrading. By going to the 200w/ch first, there is little room to upgrade the amp. But if your speaker choice changes, at least with the 7500, you'll feel confident that you have enough power. For example, if I recall correctly, Gonk changed his front 3 speakers to Outlaw but still used the 7500 to power them.