I wasn't trying to turn you away from DIY, if that's something your interested in. As I said, it can be extremely beneficial for a minimal amount of money. It just requires a little bit more effort than the brand name "plug n play" components (which do also require a little bit of tuning).
CDT's are probably one of the best bang for the buck companies out there, when you consider the price to performance and power handling capabilities. However, there are other companies out there that I prefer the sound quality of, over the CDT's, but may not boast the high power handling ratings the CDT's do.
I am running the Oz Vectors in my ride right now, and have been very impressed with them. With a little tuning the midbass really comes to life, though the tweeters will probably need to be dialed down a notch, as at normal settings seem to get a little harsh at higher volumes. Once you get them tamed though (via jumper setting or through the HU), the can be a very rewarding set for the price.
The Crystal's Squeak mentioned are also very nice comps, though I really don't see them getting the attention they deserve anymore. A few years back they, along with their competition subs were some of the hottest items out there.
Also, check out Rainbow, Diamond, JBL GTO's, Polk Audio Momo's, Boston Acoustic FS60's or SL60's (if you can find them within your budget), Memphis MCSYNC's, etc.