Welcome. The first thing I would do is go out and listen to as may different speakers as possible.
You can read all the subjective speaker reviews with all the fancy, glowing, ambigious terms the reviewers like to use, read all the speaker specs in the world, and analyze all the waterfall charts you can find, but nothing can tell you what you will prefer better than using your own ears.
Your choice here will determine what size power amplifier you need.
As for turntables, yes, MH is good but so is Pro-ject, Thorens, Rega, and many more brands as well. Ultimately, the cartridge, being a transducer like a speaker, has more of an impact on the sound than the turntable, though. But, you'll proably be going for an all-in-one where the carridge is pre-mounted and this is an excellent place to start. You can always replace it when you choose.
[edit] You might want to update your profile with your location. Sometimes this can help when recommending dealers or products.