Agree with Wayne on the Shure mics. I've not used a Peavey and make no comment on them. If you can't get a Shure mic, then Samson is a decent second choice.
For amps, Wayne made some good suggestions. In addition, I recommend that you test a Fender Acoustisonic or the Fender Acoustisonic Junior 30. There's a whole lot of country stars have used the Fender Acoustisonics in clubs. Also Roland makes some, but I've never been a big fan of Roland for some reason. I am also not a fan of Crate, though they make some as well. The Crates have too harsh of a sound to my ear. Good for electric rock, but not so much bluesy Country. Of course, everything with music and reproducing it is a matter of taste and preference.
You're going to want an acoustic amp, because most acoustic amps have a line-in for your guitar and a separate channel for your mic. That's what you want as a minimum: two chanels each with its own input and each with it's own volume and treble, mid, bass settings. One input can be a 1/4" jack for your instrument, but you're going to want an XLR jack for the mic. If your guitar doesn't have a jack and you need to run two mics, one for your voice and one for your guitar, then you're going to either need an amp with two XLR jacks (which limits your choices) or you're going to need an XLR to 1/4" mic cable for one of the mics, which is a good solution but not the best solution.
If the amp is clean, 30 watts goes a long way. More is better generally speaking, but you should be much more interested in the cleanliness of the amplification than the shear power of it. If you've got 100 watts, but it distorts at 10% volume, that doesn't help you. Better to have 30 watts of clean power that you can crank.
Once you get an amp with the inputs you need and good, clean power, you can start to accessorize based on your need, desire, and finances. One nice feature to have is an output so that you can run your mixed guitar and vocals out to a PA or mixing board with one cable. That allows you to use your amp as a monitor and reduces the need to mic your amp in a stage setup setting. Many folks do that, but being able to line it out is a better solution (at least for your sound engineer at the board).
One thing to remember - GOOD CABLES. The importance of good cables cannot be overemphasized.
- Zurf
Granted B chord amnesty by King of the Mutants (Long live the king).
If it comes from the heart and you add a few beers... it'll be awesome! - Mekidsmom
When in doubt ... hats. - B.G. Dude