If you're using a riot gear with shield, forget about dodge/evasion (which are keyed off agility, btw, not dex). Unless it's the lightest gear/shield available, and even then you can't get the Nimble feat bonus so I wouldn't try to focus on that.
Were I you, and keep in mind I haven't played a spear character yet, I would max strength, and have 6 agility for Sprint. I would have enough dex and int for Cheap Shots at least. That leaves just enough points for 7 con, which will allow you to take Juggernaut at some point (assuming you do decide to ignore dodge/evasion). You might want 6 int at some point for Weaponsmith, but that's up to you.
Strength 10, Dex 6, Agility 6, Constitution 7, Perception 3, Will 3, Intelligence 5. Just enough at 1st level. With 7 con, juggernaut, a vigorous belt, and a sturdy vest on your riot gear, you'll do just fine in HP, and with spear block/riot armor, you'll be blocking melee damage left and right.