Domain Social Forums

Hello all! I'm new here and new to the "domain game" and I like to think that I pick good names..........I guess that is my question......... I really don't do a whole lot of thorough research or anything like that, I pretty much surf the web for different technologies (usually looking for something new or pretty new) and if domains are available then I register them. I only have about 40 names, and I would guess that alot of them are pretty similar to these (pricewise)......so I was wondering if I have anything with these names or are they "no-gos"?

http://www.pciexpansionbays.com
http://www.pciexpansionslots.com
http://www.tmsdoctor.com
http://www.busconverter.com
http://www.busconverters.com
http://www.trendsetterscents.com

here is a link to all of my domains if interested
https://acrobat.com/#d=*zJWJ3s2BXK2xblGT8*Iwg

Thanks in advance

.com names are always the best to go for this extension is considered to be a TLD ( Top Level Domain ) and there are plenty of to select from, but to date.Com supercedes all.