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PaulWith the T205 set, it is very common to find cards with retouched corners. Some of the gold flakes off the corners and the owner takes a gold pen and fills the color back in. These also will be graded "authentic" by SGC (unless they refuse to grade them at all). You might find that an "authentic" card with retouched corners looks better than a trimmed card.
As long as you're not looking for an investment -- and it sure sounds like you're not -- I think you are on the right track looking for an authentic Cobb. An SGC 10 or SGC 20 T205 Cobb could be very ugly, and might be more expensive than the authentic Cobb. So, authentic may be the way for you to go.