From a budget spending approach, the Rotovac option is gonna be the best start. Two reasons.
They offer a 30 day trail period. If ya don't like it, return it.
You can get every tool you are wanting to purchase in one versatile tool, with different attachments.
I think Rotovac has developed an idea that targets start ups as yourself, with your budget and future needs in mind.
I have a spinner, a 175, and Rotovac(no tile attachments) but in the frame of your question that would be my approach.
Welcome to The Honest Cleaner.