I'm my opinion it really makes no difference what extension you have assuming your website can be found.
The problems come when you are running a site and the .com is in the same business.
Having said that, a lot of the decent .com's have been purchased and brokers are sitting on them trying to make a few £'s as the OP has found.
If the .net is available and you really want the domain name then buy it, spend time creating the site and filling it with decent content, and make sure you employ strong SEO so that you can rank it as high as you can in Google listings.
Or, failing that, keep searching for a .com that is available o as Tess said above, market as yourself.com
