Hey there,
The Audioengines are pretty decent active speakers. The difference between the two is that the A5+ uses a larger woofer and has a more capable amp, which means that it can play lower frequencies and also play a little bit louder.
I really don't know anything about the razer, but I'm willing to bet that you shouldn't bother with it.
As far as other stuff to look at:
Emotiva, given the price of the items you are looking at I'd seriously consider the 5s and I personally would chose them over the Audioengines.
https/emotiva.com/products/emotiva-pro/powered-monitors-0
There's Swan, several of which you could chose from, though I'd probably suggest the M50W
http/www.chanemusiccinema.com/swan-multimedia
What do you plan of using them for?