The stock 19 is a beautiful wheel.
I changed not because I didn't like them but to look different and to go to wider tires.
Lower and enjoy them for a while and before you know it your wheel budget will be larger. When that time comes, sell your OEM's, and move to something else.
As far as resale value, wheels are a small part of it. The hit you are taking on the car now is already large, the wheels will look a small drop in comparison.