CP is a fun pin. Its not traditional by any sense. Lots of physical ball play that doesn't necessarily involve striking the ball with a flipper. The variation I think is nice, between jump rope, speed bag, and launching the ball to punch away at the boxer.

4K for a modded out LOTR sounds about right.

Over 4K for the CP is the main concern. That thing has too look pristine. Did he cliffy up the machine? Decals and cabinet art look perfect?

After checking those things out (as well as looking for mechanical errors), I would decide from there. Above all, you want a game that is fun, and that you like it.

HUO WPC-95 machines are extremely rare to find. I have only ever run into an HUO NGG and HUO MM.

Any of the bash toy WPC-95 pins are good choices. Not overly deep, but just fun games to play. Some of them are going to be cheaper than your LOTR (TOM, CV, SS), so you might end up with some extra money. As far as finding them in HUO quality, thats a tough one.

I haven't seen Attack From Mars on your wishlist. You can probably find a nice one for around 4-4.5K. You really can't get any better than AFM, as far as fun & easy to understand pins go.

Treveism suggested MB. Great pin, but will cost you a few bucks in addition to your LOTR. I rarely ever see MB for less than 4K.

Also suggested was Spider-Man. I agree with this choice, since you will only have 1 pinball machine. Spider-Man is really fun to play, easy to pick-up, and has a pretty strong ruleset. You can more than likely find a red suit Spider-Man (on your wishlist) with what you get from your LOTR, and get some money back as well. You can order yourself a NIB Spider-Man still, but it may require a few bucks in addition to selling/trading your LOTR.