I paid about $700 for a graded "EX" which is about VCP average...This card looks about "EX" w/the blemish on front...I think $400 is a decent price but $350 would really make make it a nice deal. Do some researching online and see where vg-ish ones are priced at...Here's an alternative, this card which could be had for $330:
http://cgi.ebay.com/1955-Topps-Roberto-Clemente-164-PSA-2-Good-/120744947920?
pt=US_Baseball&hash=item1c1cf5b0d0#ht_500wt_969
BTW-if you like this card there is paper loss on the back...