With your budget you aren't exactly on a shoestring. The tight budgets are the problem. If I were you, and its primarily for display, I would find a MASSIVE blade, like 8/8s or bigger (8/8=1 inch, measured from spine to edge. Razors are typically measured in 1/8's even if it simplifies, unless it requires 1/16ths... so 4/8s is 4/8s, not 1/2. Same with 8/8s is not called 1 inch. Just a thing associated with it.)
IMO, the blades with the most heft to them are the best display pieces. Sure a 3/8's or 4/8's can be pretty and elegant, but take a look at this and tell me you're not impressed:
http://straightrazorpalace.com/galle...om-scales.html
http://straightrazorpalace.com/show-...t-chopper.html
http://straightrazorpalace.com/razor...tom-razor.html