Trek and Specialized are both reputable mfrs that make a variety of bikes in all styles (mountain to time trialing and everything in between) and price ranges (from not too unreasonable to absolutely ridiculous). I have a Trek road bike and a Specialized mtn bike and enjoy riding both of them. And there are other good brands as well.
An issue that the LBS guy may be trying to alert you to is that it's really easy to start upgrading an existing bike and adding accessories, etc to the point where you have invested more $$ than a new, better bike would have cost. A new saddle could be important to your riding comfort and essential for you to put in more miles and meet your fitness goals, however.
You might want to continue riding your existing bike for a while until you've pretty much done as much with it as you can and have lost some more weight. Then consider what you want to do with cycling and buy a new, better bike that is designed for your particular wants and needs.
We only have one LBS close to my house it is about 15 miles away. I went there yesterday to get my Trek Navigator 200 fitted to me(my nephew gave me this bike) the owner said for me not to spend much if any money on this bike, except for a seat which he put on for 24.99. All they sell there is specalized bikes, he had me to sit on a ride one which was unreal compared to what I have. He said he would recommend the Carmel 26 for me since all I do is ride on the roads for fittness. Just going to see if anyone knew of this brand and bike. Since I am new to this, any and all help would be appreciated. I did ride for 18 miles yesterday without stopping the new seat did help. That is the longest I have gone yet.
The Picture on the left is my motivation to get in shape and lose weight!!!!!!!
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