What are good ways to convert EPS to PDF?

I'd like to try to use pdfLaTeX to generate PDFs but my images are all in EPS. I would also like for the images to remain scalable. I have tried using ImageMagik's convert :

convert file.eps file.pdf 

but the result does not look good and the image becomes grainy after a few zooms. I try epstopdf file.eps , but get the following error message:

Error: /undefined in II* Operand stack: Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1878 1 3 %oparray_pop 1877 1 3 %oparray_pop --nostringval-- 1861 1 3 %oparray_pop 1755 1 3 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- Dictionary stack: --dict:1160/1684(ro)(G)-- --dict:1/20(G)-- --dict:89/200(L)-- Current allocation mode is local Last OS error: 2 GPL Ghostscript 8.71: Unrecoverable error, exit code 1 

which doesn't really tell me anything. Anyone know any other ways to convert EPS to PDF? (I have about 200 images, so command-line is better)