if you enjoy the challenge then dont stop taking the h-versions because of your GPA. we're in college.....your gpa doesn't stand for too much when you graduate (unless you're planning on gradschool immediately out of undergrad anyway)
the way i think of it, if i interview for a job and it comes down to me with my 3.55 and someone with a 3.8, the difference is negligible, especially because resume and personality counts a LOT more in job interviews than GPA.
i had enough grade worrying through high school.... i still get mostly A's here and am proud of it, but i'm doing a good job of letting the occasional B and rare C roll off my back without too much pain. now if only i could get my parents to feel the same way....

haha