MP150 or MP200

Late to the party but I have both the mp110 and the mp150.
The 150 is an audible improvement over the 110.
However I bought mine way before the big price hikes so not sure as I now would say it is the way to go.
I have heard the 200 is quite a bit better than the 150 and obviously the 500 is the grail but at what price now!
Pre price rise I would have said it was a no brainer but at $500 for the mp200 there is a LOT of competition.

Maybe look at comparable priced AT carts or Hana.

mcmvmx, You are right. Your arm is to light for the Nagaoka as it stand but, you can add mass to the tonearm. There are head shell weights and special screws of various masses. I always have to tune my arm a little to get it just right. I feel the same way you do. I would never by an old cartridge. I've used many of them back in the day and there is nothing special there. Modern cartridges are better in every way. Materials science has advanced dramatically since the 70s and 80s. 
The Ortofon 2M series has a much higher compliance. The Clearaudio MMs a little lower so you would have to add a little weight. Another cartridge that gets very little air play in the States in the Goldring 1012 GX
It is a high compliance, high output MM with a Gyger II stylus. Perfect for your arm. 

but for some reason you think that modern MM are any better?

Where did I say that ? I never said that . I said that cartridge suspensions can change over the years . Thats it 
 Nothing more . Plus I know MM cartridges as I have been an avid audiophile for almost 50 years . All my favorite equipment are old timers as Dalquisht DQ 10 , Spica TC 50 , DCM time windows . Mac 225 , Dynaco 416 with capacitance supply . Linn LP12 , Systemdek x2 , Heybrook Turntable , AGI preamp and many more . Don't jump to conclusion and read carefully my friend . Plus I stand by my original argument . It's true,  cartridge suspension hardness can change over the years . Even temperture changes on a new cartridge can change its performance on a day to day basis .

It’s true, cartridge suspension hardness can change over the years . Even temperture changes on a new cartridge can change its performance on a day to day basis .

Nothing wrong with suspension inside any cartridge from my collection of the best vintage MM at the moment, please explain how it is possible if you think it must degraded in time? They are performing better than brand new cartridges. Many more people on audiogon have seen and heard exactly the same thing, those great MM are just better made than most of the new cartridges. And they can sound better if you know which one to buy (which exact model).

Also if everything is so bad with 30 y.o. suspension that why people are buying those cartridges for very high prices for an old design?

Each time I read something like "don’t buy any vintage MM because the suspension is dried or softened" I know it’s false at least in 99% cases, bought so many of them and (as I said) the worst are Technics MM - this is where the suspension is always dead and a cart is a low-rider and it’s so easy to check before buying, just play one side of the LP.

Anyway, this is just my own experience and I bought all those great cartridges in the past 7 years, not in the 70’s. I am using them right now.  

You can buy modern replacement styli for vintage cartridges that use modern synthetic rubbers that will last for decades out side. Styli back from the day are probably bad by now. Not only that but quality control was pretty poor back then. I frequently had to go through two or three cartridges to find one with a straight cantilever and a stylus pointed in the right direction. But the bodies are just copper coils so there is no reason they could not last forever. But, today we have better materials and magnets plus we have CAD. The Goldfinger used CAD to position its 12 magnets correctly. I personally see no reason to visit the past. Modern cartridges are better if you can afford them and I can.