well i my self have the same generation civic vti.
its performance is pretty good on cng.due its high compression engine.
driving it is a pleasure ,very comfortable,more sportier
in looks and handling then the 2001-2005.
parts are not a problem.
i do hesitate to take my car to underdeveloped areas(auckward speed brakers) its low profile is good for city and motorways(more grip on road) but when it comes to mohlas ,,,
SOMES TIMES its floor bangs ON speed breakerS when full.
thats the negative point i found thats all.
ciVic is meant to be driven in CiViC areas only
floor never touches the ground on standard speed
breakers e.g. the ones near the zilla coucil,,kacheri in fsd.or
on gt road near UET.lhr.
xe is a good car too(especially if u belong to a rural area ).but it has not that much to offer(the power windows and stuff like that.
on CNG its engine will die down for sure.
i will advise u to go for the civic.