Well... to start off... I'm a huge fan of chinese bow, and str bow is my main character. Personally, I'm maxing Pach, Light, and Fire until caps force me to delevel. (Keeping 20 Cold the whole time for 20% Snow Shield). At end game (if I'm still around), I will be Pach/Light. Why Light? I have many reasons. 1: I'm a speed hog, the faster I can grind, the better. 2: Bow has AR skills and passive, and Light compliments that with PR skills and passive (seems like they are two sides of the same coin to me). 3: As nightcrystal mentioned, people aim to take out bowmen when possible, without Ghostwalk, you are a sitting duck (considering in most group fights almost everyone will have Bard speed buff).
@Anjie: I believe one of the Chinese strengths is their ability to compensate for their weak points (which is much harder for Euros). Example: Ints can have Cold for PDef and a periodical tanking skill. Strs can have Fire for MDef and +%PDmg. Ints can wear armor for further increases in PDef, Strs can wear garms for MDef and less mana usuage (Yes, I'm sure you know all of this). I will agree that as a Bower with Cold, you will seriously hurt people who aren't immune. However, considering the fact that Clerics can make the whole party immune with Holy Word... and the fact that almost every Chinese can be immune with Fire Shield... It seems like a waste of 90 masteries to me. If you really want more PDef, wear armor

lol. As for how light makes you kill faster. Uh... Piercing Force? Light gives you more dmg buffs than Cold does (none whatsoever).
@D4yw4lk3r: 90 Masteries for one skill series? Not for me, sorry. Division really doesn't add as much damage as you would hope (Bich chains division lvl 8 on a mob adds like 10-20% damage for me, so yea, no). Lowest lvl Ghostwalk is a joke... Seriously... Have you even used it? Pathetic.
Also, if anyone wants to know why I am choosing Light over Fire for end game:
http://www.silkroadforums.com/viewtopic.php?t=64586
Hope this post helped some people...
Edit: Forgot to meantion something else. I have 20% Snow Shield and sometimes (very rarely) I
do run out of MP (usually happens when I am tanking more than 4 or 5 PT Mages. I have 8.1k MP (keep in mind I'm still using large pots

).
Edit2: @Braka: Imho, 50 Cold isn't worth it. I'm 76 and I have 810 Pdef, 30 more levels into Cold translates roughly into +4.4% PDef for me. I am wearing garms also. At 90, the +PDef will be even less than 4% probably. So, I really don't think its worth those 30 masteries. But that's just my opinion.