You mention all applications in the Master Collection for use. Unfortunately there is a huge difference between these applications in terms of the hardware required to run these. Dreamweaver and Audition are among the programs that require least from the hardware and a simple computer can handle these applications with ease, Photoshop and Illustrator demand more horsepower from the computer in terms of better CPU, more memory and better disk setup. After Effects (AE) and Premiere Pro (PR) are the most demanding applications and require serious muscle from the computer.
The situation gets even more complicated in the video arena by taking the source material into consideration, the codec used, since that determines whether you can get by with a $ 1000 DIY machine or you need to look at $ 2K or even more costly machines.
Your stated budget of $ 600 can be enough for PS and IL, but not enough for AE and PR, unless you have all the time in the world and limit yourself to DV material.
Have a look at the FAQ section, there are a number of articles that will show interesting information with regard to your question and specifically look at:
Your HP Costco link results in an out of stock message
Your ZT Costco link is very likely NOT expandable due to the VERY small power supply... so you will likely NOT be able to add a video card later
For PPro video editing you want an nVidia graphics adapter http://www.pacifier.com/~jtsmith/GPU.HTM and even the low power nVidia may be too much for that computer
Also, for video editing, you need a MINIMUM of 2 hard drives... and trying to edit HiDef video with an i5 will be a study of waiting for things to happen
As Harm said... a $600 computer will work for everything EXCEPT video editing
This DIY list is just about twice your budget, but it will work for video editing
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116986 Use Win7 64bit Home if you will NEVER go over 16gig ram http://www.newegg.com/Product/Product.aspx?Item=N82E16832116992 Use Win7 64bit Pro to use more than 16gig ram BluRay writer if you want to write BluRay discs http://www.newegg.com/Product/Product.aspx?Item=N82E16827106369
2 hard drive MINimum, I use 3 (as listed above)
My 3 hard drives for video editing are configured as...
1 - 320Gig Boot for Win7 64bit Pro and ALL program installs
2 - 320Gig data for video project files, and temporary files
When I create a project on #2 drive, the various work files follow,
so my boot drive is not used for the media cache folders and files
3 - 1Terabyte data for all video files... input source & output export files
I agree with John. The HP is out of stock. And even if it were in stock, its i3-2130 CPU is too weak for anything above tape-based HDV content because the CPU has only two physical cores.
As for the ZT, there are two major issues with it: The case is too small for effective interior cooling, especially with additional hard disks and a discrete GPU added. Second, the PSU is not only of low-wattage, but also of low quality: The "350W" PSU likely cannot handle more than about 150 to 200 watts total before exploding into flames. Thus, you will also need to upgrade the PSU before you can add an additional disk and/or a discrete GPU. And even after you perform such upgrades, you'll find that the CPU and motherboard will limit the system's performance: The CPU, although it has four physical cores, is a non-K CPU that can only be limited overclocked (in this case, only up to 3.7GHz), while the motherboard is only a B75 chipset-based motherboard that does not support overclocking at all (only the Z77 chipset supports any overclocking whatsoever for this LGA 1155 platform). The motherboard will permanently lock the CPU to stock speed (3.2GHz, or 3.3GHz~3.6GHz (depending on the number of cores in use) with Turbo Boost).
Thank you guys, all of your replies were exremely helpful. You all have definately got me on the right track to discovering what I need to build a machine.