Raising the oil level 20mm or so (measured with the springs out and the fork collapsed) will greatly improve bottoming resistance, while keeping the forks plush for the first part of the travel. If you have a few ounces of fork oil, the cost is free.
Prices on suispension work can vary alot, but revalving is around $200+-, new springs around $80 - $100. Shipping and insurance (if you don't have a local shop) might be $50 - $80.
If your fork had new bushings & seals installed in December, you should not need new ones.