ARAS - on top od PDM Pro or go fo rthe full ARAS solution

I am a PDM Pro admin who is looking for a company-wide PLM solution. I have read some on ARAS as being on top of PDM Pro, or it providing a full PDM through to PLM solution, connectors etc. Obscure licensing and costs models at present, it seems. Or at least they are to me. I am looking for recommendations / arguements etc for one method or the other. I like PDM Pro very much as an engineering data management solution for Solidworks and would like to continue working with it, but if similar can be achieved with 1 (set of) tool rather than 2.....and grow PLM out into the whole company etc. Thank you.