A
custom frame is a frame built specifically to your specifications, and costs a lot more than $400. A Nashbar frame is not a custom frame ... it's an inexpensive "off the rack" frame.
At best, that bicycle might be
customised if the person who built the bicycle selected the components and built the bicycle into something that worked for that person.
Have a look at the Nashbar frames on the Nashbar site:
http://www.nashbar.com/bikes/Categor...2326&pageView=
Then price out the components and decide whether the bicycle is worth it or not.