Well, I have not used the Actron scan tools that many of the chain parts stores sell, but I did download the owner's manual for the 9135 at one time and it seems like a good unit. The first scan tool I bought was an AutoXray EZ-Scan 5000 (
http://www.partsamerica.com/ProductD...artnumber=5000) and have been very pleased with it. I got mine off eBay and it came with the EZ-PC software which is nice. However, this tool does not come with the enhanced codes (manufacturer specific codes) but the upgrade can be purchased for like $50 per manufacturer.
I later ended up going with the OTC Genisys (not what I'd consider affordable) because it would allow me to scan ABS, airbag, transmission, body computers, etc. It also can perform two-way communications with the car computers as well, and is VERY upgradeable.
I still use the AutoXray for quick scans, but even it doesn't come close to the functionality of the Genisys.
As for a simple tool, any of the ones at the link you provided would probably work fine for reading codes, but you may want to consider the Car Chip (
http://www.davisnet.com/drive/produc..._products.asp). The price of their entry version is very competitive and allows you to perform data logging. It also will read codes, download data logs to your PC, and clear codes. Some versions offer pretty much everything the simple scan tools offer plus more for a very comparable price. And yes, I do also have a Car Chip E/X and it works as well as advertised. Unfortunately, it won't work on my Lincoln LS8. You will want to check the conflicts and exclusions list (
http://www.davisnet.com/drive/produc...Exclusions.pdf) to make sure your car is compatible if you are considering this option.
-Rod