09 jamis durango 2.0 worth upgrading?

2 weeks ago i bought a 2.0 durango i got a killer deal on it and this bike in the 750.00 range(mine was 639.00) comes with better parts than other bikes in its range and i like the way it rides. anyway is this a frame thats worth duming some extra cash on to upgrade some of the not so great areas like the fork/wheels mabey some easton bars/seat post and a different saddle and stem. this bike stock is 30 pounds and some small change kinda heavy for a hardtail. or ride it for the rest of the summer and upgrade to a 2010 dakota? i ride single track trails dont race but im the kind of person that loves to have the best i can/cant afford and im a doe head guru for wasting my money on upgrading anything i own but i dont whant to waste my money upgrading a frame that isnt worthy. does anybody follow my rambling?