The Yaris and Accent hatch would be the only ones I'd be looking at in the segment.
The Aveo5 is surprisingly roomy up front - I actually fit into it vs an EH or Yaris! I was shocked at how well packaged the front is. But fuel economy (with other figures I've seen), refinement, and sophistication are lacking by comparison. Prices are great though.
Rio looks far better than Accent IMO (very European with those black mouldings and unadorned nature), but I'd want ABS and SABs. The Hyundai engine now rates up with Yaris for fuel efficiency finally. The Accent 3dr will probably be my compromise, and I like the Hyundai nameplate, dealer network, and quality more. It'll have all the features I'd want in a roomy package, healthily less than Yaris. I've been very satisfied with my previous Hyundai experiences and quality.
The Yaris is the funky quasi-premium entry - great quality, reliability, resale, engine, fuel economy, and progressive design. Unfortunately, it's uncomfortable for my body type. I also feel my RS would be at least $1,800 more than an Accent hatch, along with having a shorter warranty and higher interest financing. Quality I don't feel would justify the expense vs the Accent, but depending how long I felt I'd keep the car, resale would. But no matter how I look at it, I can't drive the Yaris. Good choice for those who can tho.
The Fit and Versa will really heat things up though. I can't get used to the fit's mini-minivan look but it has a unique interior and what's bound to be the most fuel efficient driveline, whereas Versa will up the ante on power and provide it all in a funky exterior and mature HQ interior, sized just right larger than the others. It should be the most substantial car in look and feel, although perhaps not as youthful and flingable.