Unless the PSU is a good Corsair or SeaSonic (combo) then 'modular' means zip. I typically find 'combos' are pushing one or more crap component, and only a few combos are 'good.' Generally if $30 stands in the way of me getting what I want then it's a no brainer decision to get what I want.
The Sabertooth Z77 (series) is very good and the MOBO's are built very well, and they come with a 5 year warranty. Reviews and Reviewers only have a short time to conclude anything about a particular component, and worst they're use to one BIOS and flub-up in a different BIOS -- invalidating their benchmarks. As long as you stick to the top 3 you're fine: ASUS, Gigabyte & MSI. My preference is ASUS.
About the only discussion I steer clear of are cases, as long as there's nothing obviously wrong with the case.