2 things to look at, the os is awesome in every sence of the word, and the JX imo is a step abouve. and 2 when it does come time to rebuild, the JX is less money over time, and the same price as a v spec with half the life, the JX simply out last the v spec, the sleeves are tighter, and when brokin correctly they last and hold compresion much longer.
hard choice.