Really easy solution would be to run 2 nvs 290 or 295 cards. If only 1 x16 slot available and multiple x1 slots---why not run 1 x16 card and 1 x1 card for total of 4 monitor output. Should be doable for less than $100 on Ebay. Cards are fanless, quiet, and only draw about 23 watts per card. Easy install with windows 7. Another alternative would be to buy Firepro 2460 ATI card on Newegg for about $230. Four monitor fanless card with low power needs and only takes single x16 slot. A much cheaper alternative to nvs quad output cards. Also you might want to look for a workstation on Ebay with good horsepower, large power supply, and loads of expansion possibilities. Really depends on your needs. I would stay away from consumer boxes and run with a workstation. By the time you upgrade a consumer box, you have bought a workstation. Have 2 hp workstations and really like them. No probems and rock solid. Just my opinion.
By the way: the term "splitter" is used over-generally.
If the splitter is to divide up (share) the video signals from one connector to 2 connectors, then the images are duplicated onto 2 different monitors.
If the splitter, like the DMS-59, is to separate out the pin-outs (wires) from one connector to 2 connectors, then those images are not duplicated. They are 2 distinct sets of video signals, one for each monitor.
If you truly want a superfast rig then get two drives. One drive should be an SSD which has all the system program files and any other programs you can jam on there and the other drive for just storage.
The system will boot up very fast and just be much faster in general.
BTW, the H8qe is not the most powerful desktop that HP makes. The H9se is the most powerful. When equipped with the 3960X, 16 GB of DDR3 memory an onboard liquid cooling system and the HD 6850 graphics card, its hard to imagine a more powerful system.