I think I mentioned last year that Gillette sent me a new Fusion (5 blade) razor, + shave gel, in honor of my 18th birthday...ok, since they the day right, & the per annum close + 35 yrs, I chose to keep it. Turns out to be quite a racket for them, 5 refills set me back @25 clams.
For you, LS, I'd suggest you stay with the Mach 3, & seeing as how your main squeeze likes you w/a little stubble between shaves, I'd go with an electric grooming system a la my Norelco...it's a good way to keep just the right scruff level, & a must-have if you plan to graduate up to facial-hairy status like us old guys do (to cover our double/triple/etc chins, of course).

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