Now I understand why there are so many sizes of coolers. Everybody approaches it in different ways. Yeti's Tundra series has 13 sizes now!
My personal opinion.... I tried going the cheaper route and went with an popular leading brand. It was around 100qt (for competitions) and I think I paid $90. It broke the first time out. They did replace it but I can only fill it up to about a 1/3rd or it will break again.
So I ended up replacing it with the 105 qt Yeti. I have to say, I LOVE this size. It's small enough I can get my arms around it to grab both handles. It's very heavy loaded up, but I can at least get it on and off the trailer and move it by myself. The thing I love most about it is that I can fit a full size pan in it. Actually, I can fit three. I love being able to trim/inject big meats in a pan and then simply cover the pan and put it in the cooler.
I rest everything in a full size pan as well. I use a cambro but if I ever needed extra space, the 105 qt yeti could be used as well.
For home use... Maybe it's over kill.
My 105's measure 14 1/4†× 23†× 12 1/2†(internal). That is pretty similar to the 70 L that you are considering. Yes it will be a two man job when loaded up but the bigger one gives you a lot more flexibility.