Is there a reason why u want a mac. I use them alot of I love them, Since they just switch over with an intel processor somethings are availble yet. though it will work, Have a program called rosta that helps mac pc (Processor) programs to the intel version. My recmendation for any computer is get memory 512 or a 1g.
Pro's with mac's is security and Ease of use
Cons, if ur a gamer mac isn't for you, Macs don't have the amount of games available.
I recomend a macbook pro for better performance, though the screen is 15" and 17"
I generally don't like dell's but useally have a good serivce if there's any probelms, if you get a pc laptop don't get a gateway.