Yo Thnmnt: [reminds me of LSMFT] If you remember that acronym, your as old as I am!
Your power amp is a very important part of your studio; thus, you want one that does not HUMMMMMM or BZZZZZZ and will give you enough POWER.
Alesis 1 speakers: I have a pair but don't think much of them; I also have a pair of Infinity speakers and my hi-fi pal Jorge calls them "budget speakers." You really have to hear speakers and see some studio set-ups or keep asking on this site and, Voila, you will get information. Also, check Dragon's stuff elsewhere on the site for information.
I use an integrated amplifier by Yamaha in my studio because I have two tape decks, a CD player and my amp will let me record the tape decks either way by pushing a button.
The amp also provides inputs for two sets of speakers which I have; There is also a "pure through" switch and I input my digital recorder to mix down. There is also an AUX in/out to use if needed. So, if an integrated amp fits your needs, try it. I also can play my synth right through my stereo system.
Choose wisely and keep twiddling the dials,
Green Hornet