In Case you are still unsure, I would go with the above suggestion of 98 Lite (a snip at $25) or use the free version. I am using 98 lite with a similar hardware setup to yours (as you can see below) and I have a great bootup time of about 20 seconds.
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Audio:Pioneer KEH P6900R, CD multi Changer, CD-RB20 Aux input adapter.
System:AMD550, 192 Ram, 13Gb HDD, Via Micro ATX, o/b Sound, 32Mb G/c, T/screen In-Dash 7" LCD VGA, IrMan, 120w inverter.
O/s:Windows 98lite
Software:MediaEngine 1.7.7
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