Studio monitors, or mixing monitors, are the professional speakers you will need to mix your music the right way so that your music sounds great
on every device that you listen back on. You want to be able to hear the same mix on your car stereo, your computer speakers, and your home sound system.
Many people make the huge mistake of using large monitors, at a loud volume to mix. When they play back their music on other systems they find that the bass is wimpy and thin because the bass from the big monitors bounced around the room, and vibrated the floor enough to fool your ears into thinking the bass was sounding great.
Also, you should never mix at a volume lower than 80 decibels because your ears will be fooled and you will bring up too much low end to make it sound right, and your mixes will be muddy on other systems.
You should never mix at a volume over 80 to 90 decimals or you will not hear a flat, correct and natural frequency, so your music will sound either thin and weak or bassy and muffled on other systems.
My favorite studio monitors to mix with are the Tannoy Reveal 502. When the mix sounds great on the Tannoys, I know it will sound the same on everything else. Not using good studio monitors is probably the biggest mistake you can make. Mixing on consumer speakers will spoil all of your hard work composing, recording, editing, and mastering your music, and make your work sound awful in your car, on your computer speakers, and just about every other speaker system. The reason is simple. Consumer speakers are equalized to sound better, boosting the bass and high end a little, which defeats the goal of mixing on "flat" speakers.
Professional studio monitors all do a great job because they are all flat. It really gets down to taste, and what is comfortable to you. All of the monitors in the Studio Monitors/Mixing Speakers section will do a fantastic job, and make your life so much easier when mixing and mastering your music.