it all boils down to your budget as well. if your budget allows for the iMac, then why not? the IPS screen is just uber awesomeness.

anyway, was in your shoes as well and with limited budget (after selling off my good ol' Alienware M11x), i went for the Mac Mini + Wireless KB + Magic Mouse combo for just RM2157 (got the Mac Mini for around 10% off market price).

got a spare 22" LCD lying around hence this combo lets me utilise it as well. surfing, some amount of photoshop and Excel for slightly over RM2k.