You didn't mention what kind of bike you have. Road bike?

I'd get a steep angled stem before getting a riser.

Profile Design Boa Stem 130 Degree 1-1/8 in Tree Fort Bikes Stems (cat1520)



Or, perhaps an adjustable stem.

It should be easy enough to replace on your bike, assuming you get the correct dimensions.

Some of the newer winged aero bars are more ergonomic than the old round bars. It would be worth considering, especially if you like to ride on the tops of the bars.