I have an iMac ( one gig hard drive and one gig RAM) currently running OS 10.2.8 ( will probably upgrade to OS 10.4 soon) and am looking for a good scanner that will also scan slides and negatives. I'd like to stay under $250. The Epson Perfection 4180 looks good on paper but I have read that it is slow at certain settings. Please help with any recommendation and also any comment on the 4180. Thanks in advance.