Agree with Chas here.

Rachel,
YOu are right about the 88 weighted keys ( and so is Diki).
However and once again here I see eye to eye with Chas, most arranger keyboard players are not truly proficient pianists and most music they play ( let alone most music their listeners listen to) are well served with most current piano samples in the main brands of keyboards.
As to Diki's comments on VST sounds etc. I think with all respect Diki this is an entirely different ballgame. Far removed from your "just switch on the arranger, pick a style , pick a sound and PLAY.
VST require a fast computer with a fast processor ( has its price), requires the purchase of high quality VST sounds, you mention some famous brands ( has its price) , and requires knowledge and being capable of arranging all that stuff with your computer and keyboard(s). It is entirely unsuited for gigging imho and when, like me, at home, it still requires all the aforesaid. Mind you some of these ( more expensive ) VST are fantastic. But they are entirely beyond the scope and premise of this thread, see below.
I purchased Mixcraft 9Pro which has a fair number of meritable VST sounds on board, I added the Korg M1 VST package as well as the Piano VST package Addictive Keys. All very nice but still a lot of work and not substantially very superior to what I have got now.

Ah yes.....the premise of this thread was.......:

Would/ should you if you had a little money to spare ( 200 dollars), while in the possession of one or more (arranger) keyboards but nothing from the Yamaha brand, consider the purchase of the PSR373 or similar keyboard , like I did ?

regards,
John