Something to consider in picking a speaker first. There are a lot of amps, yes. Depending on your choice of speaker however you may wind up with virtually zero amps to choose from. Or very poor choices. Search around for all the time and trouble people have had taking this approach. If all you do is consider the speaker then at least be intelligent about it and exclude from consideration anything below about 92dB, as anything below this and you quickly run into a situation where only 100+ watt amps will do.
The Raven Blackhawk is a truly fine amp. As it turns out, a lot of the very best sounding amps are even lower power. There are some pretty fine amps in the 50-60 watt range as well. Above there and it gets real hard (read, expensive) real fast to find quality sound in 100 watt and up amps. Real hard. A lot of us would say impossible. No matter how much money you have to throw at it.
Being on a budget it is simply not responsible to say pick a speaker without making this tradeoff as clear as can be.
Stick with speakers in the mid-90's and up sensitivity wise, and you will find it very easy (read, affordable) to find a truly high quality amp to drive them.
I would say without a doubt given your current setup the Raven with your current speakers will sound a lot better than the other way around doing the speaker first. Way better. Like no contest.