for a GOOD WC setup...no it's not doable for $150.
If you want mediocre, then go thermaltake bigwater, but they use 1/4" tubing, and standard GPU blocks use a minimum of 3/8" and it's a PITA to find a 1/4" to 3/8" adapter.
You need $200 and then you can get a good WC setup with complete upgradibility