I'm just re-entered biking after a LONG hiatus, and here's my advice for what its worth. Since it is your first bike, I would buy from a LBS and make sure you test ride everything first and get it fit properly even before the test ride to give the bike a fair chance. I think once you have more experience, and you know what kind of bike geometry fits you, if you want to buy off ebay it could be a great way to get a deal.
I'm 5'2" and bike fit is tricky for people of our stature, some of the geometries get messed up and you have wheels that are essentially to big for the bike, and you can have interference between your feet and the front wheel. I've heard that Trek is good for short people, and I noticed that they do size the wheels and crank lengths down on the small frames.
Do you have a strong feeling about drop bars vs. straight bars?
One thing to look at in the bikes you mention is differerent gearing...the sirrus front chainrings are different sizes than the FCR4 and the Trek 1000C WSD. I just got a trek hybrid (7200FX) that has gearing similar to the sirrus, and I wish I had some bigger gears on the flats and going down inclines. My old road bike had 52/42 up front, and I never got to the top gear, but with the 48/38/28 front on my new bike I do (rear cassettes are similar). But I live in a very flat town!
Also on the sirrus, something I noticed was that it has the shimano Sora rear derailleur. I haven't heard many good things about that particular one, which probably is why (speculation) some of the others in the same price range use the SRAM one. Shimano Tiagra is one step up from Sora, and from what I've heard it's a lot better.
If the Sirrus really felt good to you, you could watch ebay and try to get a higher model Sirrus in the size you tested (since you know that's a good fit), and thus avoid the Sora derailleur.
For other bike ideas, check this discussion about road bikes for $700 or less:
http://www.bikeforums.net/showthread.php?t=69273
Have fun!!



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The Giant was the only road bike I didn't feel stretch out on. We all have MTB/Comfort for dirt trails as well, it seems having a road and dirt bike is the way to go!
BikerHen
) because I never thought I would be strong enough to ride more than a mile or two.
Woo-hoo -- I have NEVER done 50 of anything before) and I take one road ride a week with a club I really enjoy struggling to keep up with.