I do not have any experience with the Accent, but I did install a set of OESpectrums to replace the original rear shocks on a 2007 Elantra. The shocks seem to deliver a comfortable and controlled ride, with none of the "excessive softness" that some people associated the Sensa-Tracs with. The shocks that I received were Made in Korea, too.
Considering their low price, the results and the generous lifetime replacement warranty, I would not hesitate to use the Monroe OESpectrum again.
My only experience with KYB GR-2 was on my old Saturn, and the ride that they delivered was significantly stiffer than stock. Strangely, the handling was not improved. However, it is possible that things have changed since their rebranding from the GR-2 to the Excel-G name.