[G4] Video Card Upgrade Question

[Preston Peek]

Hello All -- By way of introduction, let me state that I've used Macs for 22
years, and know enough techie stuff to just get by -- or get myself into
trouble. 

I have a Quicksilver Power Mac G4, 933 MHz, 512 RAM, with a GeForce4 MX
chipset, 64 MB VRAM. (If this isn't enough info for your response, please
let me know...)

I've just purchased a Samsung 22" widescreen monitor, but can only attach it
to my analog VGA port (no DVI on my G4). The picture, even on a Hi Def DVD,
is not so hot. I know someone who runs this monitor from a PC for gaming,
and he's blown away by it. Not so me.

My question is: If I upgrade my video card (I'm looking at a Mac ATI Radeon
9200 128MB AGP DVI Video Card) will this improve my resolution? Will
increasing the RAM (which I badly need) help?

And on a related issue: Is anyone familiar with the $299 "SuperCharged 1.5
GHz PowerMac G4 CPU Upgrade G-Celerator, 1.53 GHz with the supercharged 2MB
Cache... The "Plug & Play" 1.5 GHz that will more than triple the speed of
your Power Macintosh G4 system!?" Worth it. I could sure use some speed

Many thanks in advance for any help you can offer.

Preston