Hmm, some questions for you.
I am only a beginner. I would like to get into this as a serious thing which is why I am going to go with an Imac over a MBP for the ram and all that jazz. Would the screen be fine for me right now, and could I simply get a non glossy screen later? I do want to dual monitor the Imac for sure.
How much did your screen cost you? What should I look for in a comp screen if i go to a place like office max or bestbuy? Also what did you use to calibrate your imac screen. I have heard of the spider thing, but is that what you used?
iMac screens are actually not bad for photography, but not 100% ideal, either. When you begin to get more serious in your craft, where things like print matching become very important, you'll start to see the advantage of matte-coated displays, not to mention higher-bit panels with better color LUTs (look-up tables). Eventually, you'll want a quality external monitor as your needs progress.
There's really three tiers of monitors...
The first tier would be the entry-level consumer monitors with 6-bit TN panels. These monitors are cheap (some of the 27" models are under $300), but really only ideal for office applications and gaming. These are the monitors that big box stores sell. Avoid - the iMac, despite its lack of fine tuning controls, has a vastly superior display already. Brands: way too many to list.
The second tier is filled with IPS and PVA based panels in the $500-1500 price range, depending on size and features. These will generally be 8-bit panels (some may be 10-bit) and may even have 12-bit color LUTs. Most will be CCFL (cold cathode florescent) backlit, some will be LED - but that wouldn't necessarily be a deal breaker as it has very little bearing on actual picture quality. Some of the higher-end models in this tier would be worthy upgrades to the iMac's built-in display. Brands: Dell (UltraSharp series), HP (Performance series), NEC (MultiSync 90 and PA series), Samsung (SyncMaster T series).
The third tier represents high-end panels with 10/12/14-bit displays and generally cost $2000-5000 and above. These panels are extremely high-gamut (often 100% Adobe RGB and >100% NTSC), have 16-bit LUTs and highly flexible color adjustments. Brands: Eizo-Nanao, LaCie, HP (DreamColor LP2480zx), Samsung (XL24).
As far as color calibration is concerned, it is typically done with a colorimeter. You can get a very decent one for $150-200. I personally own a Spyder3Elite. Huey makes good ones, as well. Some of the bleeding-edge Eizo and LaCie models even include their own colorimeters.