4130 is standard chromoly steel the iro mark v and the pake are both made out of no descript tube sets(the tubing used to make the frame) other slightly more expensive frames have name brand tubes that are butted ( the thickness of metal varies over distance making it lighter usually thicker at the ends and skinnier in the middle) i.e. tange prestige columbus reynolds 52o, 631, 831
for about the same price as the pake you can get a cayne uno or a khs flite 100 from spicer and for a little more you could get one of his standard al frames which are very nice if you are feeling the weight thing
check out spicercycles.com