I went thru this same mind game not too long ago. I found that buying an already finished LQ trailer wasn't much different in cost compared to buying a shell trailer and having a conversion done. With a conversion you can have the LQ done to YOUR liking and design and not in such a cookie cutter style such as finished LQs. You can also delete some things that you dont' really need that you found in a finished trailer, saving you some $$. However, I always say now, get what you want right now, and not be kicking yourself later!

Another thing, if you are a patient person, a conversion might work for you. Some conversions can take 6-8 weeks to have done. Do you want to wait that long?

I ended up buying a used '03 trailer that was bought as a shell and the owners put in a LQ conversion. It had everything that I wanted, and then some, and I love it! Don't pass by some of those used trailers out there!

back to your question- price them out. Find a LQ thats finished with the stuff you want then price out the shell + conversion. Look for good used trailers too as MI said.

 Conversions are nice if A- you have specific needs and B- if you are willing to wait for it to be done. Doing it yourself is pretty OK if you can do it. The people I know who did the LQ themselves simply enjoyed it, found it to be a project but it took longer than expected. My bet is you can find pretty much what you want in a finished-ready-to-go unit.

One option that should be eliminated right away is the DIY.  If you try it yourself, the chance of a botched job or botched looking job is very high.  Finish work, plumbing and electrical are not forgiving in the smallest details.  It takes lots of talent and indepth knowlege to do right.  A little knowlege will get you into a large amount of trouble.  I speak from personal experiance...