I'd look at the Yongnuo flashes. Had mine for several years now and they are still going strong. Whether you go TTL or manual is up to you. TTL is better for event photography of anywhere that you are constantly changing the distance to your subject. The camera controls what it thinks is the correct flash power output. Manual flashes tend to be a bit cheaper and sometimes offer slightly more control over the power output. What you opt for is whatever is going to work the best for you, although I think your budget is going to be the deciding factor. I know you want wireless flashes but, without a trigger on the top of the camera, you'd have to use the flash as a slave if off camera. I can't remember if the D3200 uses the Nikon CLS system either, which could present exposure issues.
Personally, I really like the YN560 III, as they have built in radio triggers. Used in conjunction with the TX controller unit, they are very effective and easy to adjust from the top of the camera. If you could somehow manage another $100, you could get two YN560 III and a controller unit for $160. They are manual flashes, so it's easy to screw up your exposure until you dial in the right power you require, but if you are doing posed portraits or still life, this isn't a big whoop. After a while you'll know that at a fixed distance, you normally use "x" power on the flash, so you can ball-park it, then fine tune.