Replying to Boot Upgrade or Punch Plastic?

At the end of last season my boots started giving me pain on my arches so I had some custom footbeds made hoping to eliminate the sore feeling I got in my boots every time I went skiing. The footbed made things worse so I went up to a well known ski shop about two hours away from my home mountain to see if they had any ideas of what I could do. The guys fitted me and found that I had been riding a boot that was too long and too narrow (27cm, 98mm last) (the boot fitter that fitted me when I got these boots did not know what he was doing). They recommended a Lange SX100 and a Rossignol All Track Pro 100 both at 25cm with larger widths and both are around $400. They said I could also punch out the plastic on my old boots to make them wider for $30 dollars a boot. I'm wondering is it worth dropping the $400 on the new boots or is it better to just punch out the plastic on the old ones?