The CPU, the hard drive, the video card, and the OS.
Yes. Lil Chillbil, take note. Many things can be done. See below.
I bought some stuff and I upgraded the specs up to
400mhz powerpc g4
80gb harddrive
16mb video card
2gb ram
dvd burner drive
zip drive
os x 10.4.11
I also bought it a 17" studio display monitor apple keyboard and mouse
10 100mb zip disks and a external 3.5 inch floppy drive with 50 1mb disks
so I want to know what else I should upgrade this summer
Any particular reason to keep using the Zip drive? CD-R/DVD-R is a wonderful thing - much cheaper and much higher capacity. You could return the Zip disks you bought, toss the Zip drive and use the open drive bay for another HDD. Seriously, unless you really need the Zip drive for some reason, you may want to consider other options. Just a thought.
If you really want to, I guess you could get one of those 7448 upgrades. Then, though, it would be essentially a different computer, and those 7448 upgrades are really expensive, even with the significant performance boost. I'm not completely sure your G4 model is compatible with it.
I have a PowerLogix CPU upgrade in my Digital Audio (upgraded from stock dual 533 mHz to dual 1.67 gHz). Well worth the (somewhere between $400 and $500) I paid for it in 2006.
You don't need to use an ide drive. There are sata to ide adapters available
For that matter, Lil Chillbil could buy a Sonnet PCI SATA card or two (depending on the number of drives he wants to install - they each run 2 drives). Then he could buy either SATA HDDs or SSDs to run off the PCI card(s) instead of off the motherboard's ATA connection.
Lil Chillbil this will also solve the HDD capacity barrier per your question below.
You could get an SSD for your boot drive and use HDDs for your data. Many users do that and enjoy the benefits of increased speed from the SSD.
is the 128gb how much I can store per drive carriage like I could install 2 128gb hard drives or is that the total limit
Sonnet PCI SATA card (see above) breaks the 137GB per drive limit. As an example, my Digital Audio has two of those Sonnet PCI SATA cards running a 1TB drive and two 500GB drives.
Here's the card I'm talking about:
http://eshop.macsales.com/item/Sonnet Technologies/TSATA/
It would be a good idea to make sure this will work in the Sawtooth model.
Lil Chillbil, there's a lot you can do to your Sawtooth depending on how much you want to spend. I don't know about video card options but I'm sure a quick search on google or on this website will turn up some results for you. You can do a lot more upgrading if you choose to. About the only thing I haven't done with mine is an SSD upgrade.