for truly decent Chinese red wines, go ahead and read www.grapewallofchina.com
My absolute favorite at teh moment is made by grace vineyards and it compares favorably to most australian or chilean wines.
as far as the standard run of the mill reds, there is a plain bottle of great wall sold everywhere in bum f@ck middle of china for about 25 RMB that is just amazing... (we went through about 20 cases this past bootcamp) unfortunately, i have yet to see that specific bottle in a big city.
next in line is a yellow label great wall that retails for 40-46 rmb with has a nice fruity after taste and a good bite to it, it says merlot on the bottle but it's more like a cabernet.
I haven't been able to sample the suntime yet but i'll set out on a mission to find some this weekend.