The Antares one is ok I guess. But is there any other you could recommend?

Melda Mharmonizer is probably the cheapest...$54 but it's not 
point and click...it takes some work...

http://www.meldaproduction.com/plugins/product.php?id=MMultiBandHarmonizer

Izotope Nectar 2 has a harmony module also...

I find Harmony Engine Evo to be the quickest and easiest to use to get acceptable results...

Zplane has Vielklang Instant Harmony

https://products.zplane.de/vielklang

You can also build Harmony parts from scratch with Melodyne Essential or Editor...
but again it involves "knowing" and "working" to get good results...