Personally I will only buy pants 20K or higher, although 15K+ is probably sufficient. I definitely wouldn't go any lower than that unless you plan to buy new pants every season, use waterproofing wash/spray regularly, and don't do much hiking/sitting/falling.
18 Rossignol Sushi . 17 Arbor Terrapin . 17 Lib x Lost Mayhem Short Fat . 17 Capita Spring Break Slush Slasher . 16 Never Summer Swift . 14 TJ Brand Retro Fish
17 Union Ultra . 17 Rome Katana . 17 Burton Malavita Wing . 16 Burton Genesis X
16 Flow Talon