CEL light just came on, What do you guys recommend??? Options

[k-weaver]

Ok so I just got home and picked up my fiance to drive to the movie store to take back a dvd, no problems then and none in the past. After returning the DVD I start my car and my CEL is on. I drove all the way home (about 3-4 miles) no problems. Car does not feel ANY different. It bothers my though knowing SOMETHING is possibly wrong with my car. So I got to thinking...

I can take my car to the dealer (or a local shop) and have the car looked at. I'm estimating that this will be about $60-100 depending on where I go. I have the funds to have the car looked at, but depending on the problem, I might not have the funds to fix it. So I got to thinking some more and realized that Kragen sells the CEL code reader for $99.99 (cheapest one). So I was just wondering if anyone has used one from Kragen (probably not the greatest) and if anyone has, how has it worked?

I would also like to get some more opinions on this, see what one of you guys would do if you were in the same situation. Also, can anyone recommend anything for me to check? Would rebooting the computer (unplugging the battery for about 10 mins) help? Any input is appreciated, thanks in advance guys...

Current engine mods:
96 Celcia GT
CAI
Header (cat delete)
NGK Plugs
CatBack Exhaust (2.25")

[k-weaver]

Ok, so i went to autozone and rented out the tool. Plugged it in and the error code was P0420. The device that I rented actually told me what the problem was. It said something along the lines of my catalyst not functioning properly. I am assuming that it is referring to my cat, which because of my header I no longer have, Even though the header I purchased has the spot for the sensor...So I just erased the code, CEL no longer on. I also stopped by pepboys for a fuse holder (planning on getting some neon) and it turns out they are going out of business in my area. Lucky me . They just so happened to have the code reader on sale for 39.99. Its not the top of the line but it will get the job done. It also came with a book and CD that has all the codes with the definition.

So as far as I know, the car is fixed (not that there was anything really wrong in the first place). Thanks everyone for posting, you guys saved me alot of $$$.