Random observations.
Your Sony CD player will need to be connected directly to whatever amp/receiver you wind up with.
Likewise, you need to decide if you want two channels or leave room for expansion into a 5.1 system in the future. In either case, you can add a sub-woofer if you want.
If you decide to go with two channels, there are quite decent receivers out there starting at around $100, NIB with a manufacturer warranty. The
Sherwood RX-4105 is a proven performer. Being two channels, you would need to use an analog connection between the sources and the receiver but that's not a big deal.
Those Pioneer speakers are quite good. If you choose, last year's version of that speaker is available for a bit less. See them
here. So, with those speakers and that stereo receiver, you come in > $200.
In either case, they are both 4" speakers with all that entails. They are very clean, clear, musical, and require a bit of power (which the Sherwood can supply) but you'll probably want to add a subwoofer fairly soon.
For about $200,
this sub-woofer will fit in nicely.
Of course, you're committed to two channels. Going to a 5.1 receiver will simply cost a bit more up front and everything I recommended here is still valid.
Accessoris4less is the place to buy refurbs (I buy them there) but for new stuff, Amazon doesn't suck.
P.S. Now would be a good time to join Amazon Prime so you don't have to pay shipping charges and you can stream free movies over the Internet as a bonus.