I bought a Soyo SY-K7V Dragon+ in November.
"It uses only DDR, no option for SDRAM"
PC133 is too slow to keep your Athlon or Duron supplied with data. You need PC2100 DDR to get the performance you paid for from the AthlonXP. Memory is about twice as expensive now as it was in November, but it's still pretty cheap. I would be more concerned that the SY-K7V uses the KT-266A chipset rather than the new slightly-faster KT-333 chipset.
"It will not do ATA133, only ATA100"
At the moment, you will not see much performance difference between ATA100 and ATA133 because the drive's hardware is much slower than the interface. As faster-spinning drives with high bit density and/or larger on-drive cache appear in the future, you may eventually be able to see a difference.
"It has only five PCI slots"
This motherboard comes with:
1) Promise Fasttrak 100 Lite on-board RAID controller (can also be used as an additional IDE controller)
2) C-Media
CMI8738 6-channel audio (including optical and SPDIF/AC3 digital output at 44.1 kHz). This is a more advanced version of the audio chip found on the Hercules
Muse XL sound card.
3) On-board VIA 10/100 Ethernet
4) Six USB ports (requires an extra $9 cable to use the last two)
5) Smart Card Reader (I haven't found a use for it. Do you have a G3 cell phone?)
6) AGP4X Pro slot
Other than possibly an IEEE-1394 card or SCSI host adapter, what do you need to put into the PCI slots? All five of mine are empty.
I do not believe that Soyo has a KT-333 board out yet, but the Gigabyte
GA-7VRXP has a nice list of features, Compared to the SY-K7V Dragon+, it has the advantages of ATA133 RAID and USB 2.0. The on-board Creative CT5880 is significantly less capable than the C-Media 8738, but it is much better than AC97 sound.
