The vindicator is an excellent choice, and a fire magnet, but slightly more pricey than its chaos counterpart. The options are all reasonably: grab an extra weapon to lower the chances of having the main cannon destroyed. Take extra armour and the storm shield: both great choices. Then on the tabletop, roll forward with your S10 cannon and shoot away! The S10 ranged weapon is awesome.
Let's look at a pair of builds:
Vindicator, siege shield (135 points)
Add on a cheap third weapon to taste and you've got a winner. This should/would be the basic set-up for most "standard" vindicators out there.
Chaos Vindicator, siege shield, extra armour, extra storm bolter, hunter-killer missile (160 points)
A fully decked-out vindicator with all the options (except the dozer blade -- whats the point with a siege shield!). Use the missile on turn one, and then plough forward shooting at liberty. Even take a pot shot at a tank shock if the tank lasts long enough.