OK, I'm adding a lot of detail to this post to portray what I've done/what I'm after, but there ARE some questions at the bottom, I promise

I'm setting up a computer for my little brother to put into a cabinet we're going to be starting, soon. The computer is a p2 400Mhz with 320MB ram and 13GB HD space running Win98 and MAMEWAH 1.52...
I'm TRYING to set it up so that you'd have to be paying very close attention to tell it's a PC running Win98 rather than dedicated arcade hardware.. I've got it ALMOST exactly the way I want it, thus far.. There are just a few small annoyances.. Here's the bootup process:
1) I overrode the default Intel MoBo's bios boot screen with an Atari logo. Does a good job hiding the memory initialization/IDE discovery
2) Black screen with annoying blinking cursor

3) MAME Win98 boot screen
4) Black Win98 background
5) Clear arrow, background, and busy cursors
6) MAMEWAH as shell

So, there's really not much pointing out that it's a pc (although the MAME boot screen is pretty obvious).
I've got MAMEWAH set to shut down on exit, so it displays the MAME Win98 shutdown screen, then the annoying black screen with cursor, and powers down the pc...
MAMEWAH is running great with MAME .37b16, .55, and .65, SNES, NES, and Atari 2600 emulators. (The attract videos still aren't working, but everything else is fine...)
Switching between MAME and Win98 is easy. I've created 2 batch files:
1) Hit F8 to get to command line mode and run Windows.BAT which:
- Copies a system.ini file with Explorer as the shell over the default system.ini
- Copies the correct cursors over the arrow, background, and busy cursors
Just reboot and voila! Win98!
2) From Win98, just double click on MAME.BAT which:
- Copies a system.ini file with MAMEWAH as the shell over the default file
- Copies a clear cursor over the arrow, background, and busy cursors
Just reboot and voila! MAMEWAH!
(The clear cursors were in MinWAH's MAMEWAH beta files

I could write a program which just changes the shell line in the system.ini file, but that file shouldn't change much, anyways, and i'm just lazy

Anyways, as you can see, ALMOST perfect.. So, my questions are:
1) I'm not a big fan of the Atari logo for the bios boot screen.. Would love to find the Neo Geo boot screen..? Anybody know how to get a screenshot of it?
2) The MAME Win98 boot screens just SCREAM Win98 to me.. Any suggestions for improvements? Would love to have one that looks like a screen initialization or something.. Maybe a rom check.. Any thoughts/links?
3) Same with the shutdown screen.. Can I just make a black bitmap into a logos.sys file? Maybe just put some white text that says "Powering Down.." or something?
4) Screensaver.. I really don't like the 'snapshot' type of screen saver. Currently, i've got the system running the "arcade84.mpg" movie which i REALLY like, but was looking for alternatives. My preference would be to run through a bunch of attract modes.. But the preview videos aren't good enough quality.. Is there a way to make MAMEWAH start up a random game? Or maybe start up a game from a list of games so it shows some cool attract modes?
Anyways, those are my questions. Just wanting to get it as "perfect" as I can

THANX!