I have done both, and honestly speaking it doesn't matter either way.

Alot of games get trashed because of theme alone or who made it. If you enjoy it what does the price matter? TZ is not necessarily more fun than Stargate to some people, yet TZ is twice the price. JP is a great game with a lot of depth, t2 is fun just not very deep.

If you have the space I say quantity. In my case I decided to cut down for two reasons. One was that I live in a small apartment and going from 5 to 3 gave me space for a workbench. The other was that I only ever had one or two running at anyone time and tended to sell of the working ones. Now I am looking to make one more move (nascar and jp for lotr) and will be done for a lonnnngggg time.

If TZ is your only pin then I would suggest trading it. Depending on condition you could be looking at anywhere from 4 low end pins, to 2-3 very solid titles.

TZ is good, but to give you an idea you could get a nice Shadow and a nice JP and still have a bit of change left over.