Dear Lynn,
I agree with the rest of the responses here. Stay put if you are happy with your current residence! While it is true that you may get more house for your money, don't forget about property taxes! My ex and I had a home built in Bolingbrook on the border of Naperville, and one of the reasons why many of the original owners no longer live in our subdivision is because the property taxes are so high (thanks in part to the new Bolingbrook High School that was built a couple of years ago). I am very thankful that we can continue to afford that home! Should you decide to move to Plainfield, do your research on builders. I am very partial to Pulte because of their quality work, customer service and overall reputation. They offer homebuyers an array of options and will custom build if their options do not work for you. My house was built by them, and I can't brag enough!
In reference to Plainfield and Joliet...I just moved into an apartment within the vicinity and while I like it, I find that I am not as pleased with it as I anticipated. The area that I really like in Joliet is the Cathedral area- there you will find what I call "character houses" that look like they were taken from Oak Park and River Forest. Very beautiful!
I will say that I don't plan to be in the area beyond a year...for me personally, it's just not a good fit. Naperville is definitely more my style because it is similar to the North Shore where I grew up. Plus, it's much closer to I355 which I take on a daily basis to work.
I don't know if I helped you much, but to reiterate, if you are happy where you are, then don't move! You will probably regret it! If I can be of more help, feel free to email me at ____@____.com of luck! D.