I agree this is a good pick, but I took the Over 7 for the game as a whole. In fact, before I read your post - I had made it my inaugural pick on this Site. Here's to starting out with a 1-0 streak. :-) Adding to your analysis - the Dodgers bullpen is usually good, but has been shaky of late with a collective ERA over 5. Also, the Dodgers defense has been bad of late.
There's also reason, however, to expect that the Dodgers will score runs. Against the Rockies starter - the Dodgers are batting over .300. Puig is a streaky hitter, and he is hot right now. Ramirez and Kemp both have good success against the Rockies starter and Gonzalez continues to be hot. It all adds up to runs on both sides. Good Over however you play it.