Also there is a huge difference between a 38 ft boat and a 48 ft I know it looks like 10 ft but the reality is that a 48 ft boat is more than twice the boat a 38 footer is.
In addition to purchase cost and annual maintenance cost figures we also need to know where you intend to sail. Some areas are limiting on draft/mast clearance/insulation.
If you don't have much then a ferrocement boat is a good option. Something like this CLICKY