How many LSI speakers are you going to have? If you just have 2 with no plans to upgrade to other LSI's then you can get a 2 channel amp of at least 200wpc to run them.
If you plan on having a HT with the series than plan on getting a 5-7 channel amp to power them.
I wouldn't risk that nice receiver, or the speakers being powered to their full potential with that Pioneer. Otherwise, you will have to watch out for how loud you turn up the volume, in order to prevent the Pioneer from going into protect mode. (which is a common occurance with a receiver trying to drive LSI's.)
Good new brands of amps to look at are Emotiva, & Outlaw Audio. Or you can get more for your money buy used from Audiogon. Other brands to look at are Parasound, Sunfire, Rotel, Adcom, Nad, B & K.
The more power you feed speakers the better they sound. But this is essential when trying to drive 4ohm speakers like LSI's.
My brother has the bookshelf LSI 7s and they really came alive when matched up with a Parasound 1500A 205 wpc amp. And the amp doesn't get hot even when pushed hard for a long period of time.