Any graphics card is "probably" better than no graphics card. My concern is the price the darn things are going for (even a crummy one... and half-a-grand for decent ones)! I could use some choice words, but anyway it will be fun to play around with. :p
BTW, hey @Mechy, what's your thoughts on removing that one resistor near the back outright, for using modern LCD monitors? I saw your comment a couple years ago on that thread on EAB. Thanks! 
you can go ahead and remove that resistor, i fried the one on my pII

a few(5?) years ago softhut was selling the gvp gfx cards for $159 new i think. around the time they had new 4060dt's and such.
Remember, take care of your amiga hardware and it will likely sell for close to what you paid for it. its a good investment imho. i bought a PIV new in 1995 and used it for over 10+ years,sold it for what i paid.. i cant complain.. i shouldn't of sold it,but found another a year later :)they will likely go up in value like 060 accelerators.