The Cohhilition

The first time I played the mass effect series I did so on console with no DLCs at all. I want to play again, but this time with all DLCs enabled. My problem is that I can't figure out if I would be getting all the DLCs with certain purchases.
I was thinking that I would buy the games on origin; get the trilogy for $15 USD and then get the $5 USD upgrade for mass effect 3. However I don't know if this will get me all the DLC for ME2.

My second idea was to buyh ME1 and 2 on steam and then spend $15USD on the ME3 digital deluxe edition on origin, however I still do not know if that would get me all the DLC. is there anyone who knows more about how this DLC works?

so after spending over an hour with EA support doing idea one will still mean I have to spend $48 USD on DLC to get all the content. >.< and that doesnt include DLC for ME 2. RIP playing mass effect