Bit late, but no, do not buy a SID. The only people who like SIDs are army types who consider an eight hour marathon XC race 'a quick ride around the countryside'.
Yeah, my appetite for long stuff off-road is much much much lower than on-road at the moment. 3hrs w/ no water and no food, having to concentrate on not dying knocks me about a bit. 3hrs on the road bike with no food and water and I've barely noticed I've left the house.
Bit late, but no, do not buy a SID. The only people who like SIDs are army types who consider an eight hour marathon XC race 'a quick ride around the countryside'.