The Truth behind Head Units Power Now with technology advancements with T-Class, you'll probably start seeing head units that can do 30 (+) watts per channel R.M.S. in the near future.
If you can afford an amplifier, I would get one. You'll love the difference it will make. There are plenty of deals to be had on the internet. You could always go the EBAY route and pick up a great amplifier used. Or, pick up an amp on sale.