I think the quad 4 was a good choice at one time but the Ecotec has outperformed the quad 4
I've got an Ecotec and extremely happy with the performance and reliability
If I was starting over I would look at the Honda also
Not saying I'd go to the Honda but would weigh my options
Personally I'd not put a lot of time, money or effort in a quad 4
Regardless of which way you go, look into an Accusump it's the life saver of these type engines