I've owned both THA 187 and the NGP.
THA 187 was from the 5AXIS factory, and I didn't like them, although the mount point was funny and I've heard that most people didn't like their 5AXIS THA187s.
The NGPs on the other hand were out of the the Elan factory, and were my favorite ski ever. I put a touch of early rise into them, and they were unbelievable. Crushed crud, railed groomers, and skied steep chutes and trees like a dream. Some of my best runs on snow were on those skis.
And then there's the Early Rise ski. It's identical to the Elan Boomerang in shape and rocker profile, and it comes out of the Elan factory. I say it's a Boomerang, 9 says it's not, but if it walks like a duck and quacks like a duck.....
Oh, and Levelnine has them all for dirt cheap. If you can handle it, get a pair of NGPs and 188 Early Rises, and if you can't, a pair of RDS and 178 Early Rises, and you still have spent around $500.
It doesn't matter if you're a King or a lowly street sweeper, sooner or later you'll dance with the Reaper.