The 7100 would be enough, you will find them to power your speakers for the full range well if your speakers are 8 ohms or less nominal. If your speakers run above 8 ohms, then you will want to go with the 200W amps. For instance, a speaker may be rated for 8 ohms, but in real world testing, it may run nominal at 6 ohms or even 10 depending on the test. Something to look into for yours so you can be sure if they are in need of more or less. Of course, if you don't know, the buying the bigger amp is always a sure thing, ie the 755 and then adding something like the 200's later.