Eheim 2080...last filter you will ever have to buy... I just made the same move from a 75gal to a 125gal, I was running an AC110 and a Eheim 2026 and then upgraded to just a eheim 2180 and a UV sterilizer.
Well I picked up a used Xp3 And filled it full of bio, It took all of the bio from both my ac110's plus a brand new package, I have foam in the bottom of both 110's plus carbon, I will add a second block of foam to both the 110's for mechanical. Man am I ever Happy with the XP3.
Well the cost of a new filter vs picking up a used xp3 for about $60 usd convinced me. A new XP3 up here runs $175 plus tax. The guy I got the filter from has a second one for the same price that I am inclined to go pick up as a spare.
I agree that the xp3 with the two hob's will do a fine job. I run two penguin 350s and a xp3 on my 125. Water conditions are awesome. I do think that a heavier stock tank might need another canister, depending on how much you feed them. Would love to see some pics!