I'm chiming in a bit late, but I think it's really a matter of how it "reads" to agent or editor to whom it is submitted. My first sale is a first person novel (I even alternate narrators in a few spots), but it works for my narrative.
I can't imagine the first five Amber books being anywhere near as effective in third person. ON the other hand, it might have helped the last five...
For a good example of knowing when to shift from first person to third person, take a look at the Dragoncrown War Cycle by Michael Stackpole. The prequel, The Dark Glory War, is first person, but the trilogy itself is third person and it works quite well. The Dark Glory War is very personal, while the Dragoncrown War Cycle itself is more epic in scale... the narrative style fits the narrative.
I can't imagine the first five Amber books being anywhere near as effective in third person. ON the other hand, it might have helped the last five...
For a good example of knowing when to shift from first person to third person, take a look at the Dragoncrown War Cycle by Michael Stackpole. The prequel, The Dark Glory War, is first person, but the trilogy itself is third person and it works quite well. The Dark Glory War is very personal, while the Dragoncrown War Cycle itself is more epic in scale... the narrative style fits the narrative.