Yeah those amps will work, however the Pioneer one is right on the minimum recommended power rating for the Seirra speakers. That might not be a big deal if you aren't a hard rockin' guy, but I would still go for the Emotiva, even though the Pioneer has more features and inputs.
By the way, neither has a sub-out I don't believe, so you will have to wire the speakers through the sub, depending on your source. The sub will have inputs and outputs for high level speaker cable if you need to do that. What will be easier is if your source (ie CD player, iPod, etc) has multiple outs, you can just connect one of them to the sub. You will have to use the sub's internal crossover. For Sierra 1s, I would set the crossover to 50 hertz to begin with, and see if that sounds good.
As for speaker cable, there has never been any proven audible difference between fancy $3K cables and coat hangers, so don't let anyone convince you to get expensive stuff.
Monoprice and
Blue Jeans are good sources if you want to order, but I always just go to Home Depot and get speaker cable there, 14 awg is good enough for most runs.
CD players aren't really a big deal, past a certain point. I have a refurbished Denon CD player that cost me about $100, and since I am using the digital output, nothing is going to sound better than it, even though it isn't special. Since you are going straight into the amp from the CD player, you will want one with relatively decent, low noise analog outs. You should be able to find something like that for $150 or less. It would also be handy to have more than one analog out so you can run that straight into your sub, and not have to run your speaker cable through the sub.
If you have any questions, don't hesitate to ask.