whats the best starting power mod .. just bought my 2003 3.0L v6 .. i have no idea what to do with it

 

Here's a good link.
http://groups.msn.com/RangerBill/newbies.msnw
I'd have to say underdrive pulley, electric fan, K&N, catback. No particular order there.
Whipple will have a SC coming out in the next few months designed for a stock 3.0. If you have the money to go for it, just do the catback or nothing depending on the power you want to see.