There are some lines, such as complications ( one per brand ), or themas ( Chronos, Chronometers, GMTs, Minute Repeaters, Alarms, and so on ), or one brand ( all the watchesz of a brand ).
There is another line: Buy what you like.
In any case, take your time, read some articles on watches you like, TRY them,... Take your time as learning to know the watch you desire is a big part of the fun.
Enjoy!
Nicolas.

I am a firm believer in diversification...do you see yourself sporting a gentlemen"s watch on your wrist? a Lange or Patek or VC perhaps? i can only add to the body of wisdom already rendered here...
1)take your time..
2) dont listen to the sales representative...always discount what they say by 30% AT LEAST!!! but listen t fellow forumners, and give premium of 30%
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3)oh yes...dont pay premium for Limited Editions, if watch is available in regular production
4) go for best of breed...eg Piaget or VC for ultra thin movements or AP RO or Nautilus for sports watches.
5) this one is just personal...but i think yellow gold is back in fashion and is going to be BIG in 2012...only if you are fashionable sort of guy. I dress like a cross between a hippy and pauper, and look like one....so i cant pull it off.
happy hunting....in the words of Greg Anderson..."Focus on the journey, not the destination. Joy is found not in finishing an activity, but in doing it."
best,
Horo
or maybe a Panerai? bracelet or leather or rubber strap? practical considerations to be had.
best,
Horo
but i suspect a 44mm Luminor will suit you better. alternatively, have a look around some A series or even Pre Vs....if you are swayed by tritium charm...that may be the way forward.
best,
Horo
cheers,
Horo