Wrecking Crew, nice choice on the HU! I almost got that one, but got the 805 that Flyingbrick mentioned instead, and I absolutely love it!!! I know you'll be happy with that one. Even the factory speakers sounded great powered by the JVC. You might want to get speakers but wait on the amp to see how it sounds. If you get good speakers, they'll handle the power an amp can throw at it, but if you hold off on the amp you might decide you don't need one. It's been a while since I've dealt with 6.5" speakers. The last ones I bought were about 5 years ago. They were Polk, and were excellent. I personally don't judge how a speaker sounds in a store, because it's completely different than a car environment. I go by the specs, brand, and reviews. If you understand all the technical stuff about speakers, you'll be safe making a choice based on the numbers.
One other thing....
Obviously the choice is up to you, but I'd suggest at least considering the 805 if you haven't bought the other one already. Like I said, I was leaning toward the one you're looking at, but ended up with the 805 for a few reasons. The one you're looking at only has 2 sets of preamp outs, where the 805 has 3. Also, the display on the 805 is MUCH nicer. While the 59 has HD radio built in, as well as a 7 band graphic EQ (the EQ was the main reason I almost got that one) if you compare them side by side, the 805 is better to me. But like I said, the 59 is going to be an awesome receiver anyway!