If you dont want to waste money buy the hand gun at first (to get started) save for sniper (for many one shot one kills) then the x-ray (for the total awesomeness) makes sure you max out reload though
You need to work on balancing levels. Level 1 was like, "oh this is easy"
level 2, "What The Fuuuuuuu!" Then now im tempted to give up on level 3... I'll say 3/5, mabye 4/5 if i can pass this level ;p