Nokia X6 is a decent model and the package is total VFM for 15k-15.5k.
SE Hazel : Similar to X6 but not a touch screen mobile. A good allrounder and good for those who prefer phones with hard keys.
HTC Wildfire: hmm. this one should be around 12k-13k and anything more than that means it's overpriced. The low resolution display and battery life can be deal breaker here.
among the current crop of phones, if you are okay with Symbian, Nokia X6 16Gb makes most sense. I am not sure about C6. It's a new phone, noone really knows how good the firmware is or how good the build quality is. From videos, the build quality looks just okay and to me, it looks ugly when compared to other Nokia phones in that segment.