Long list of stuff up there. The most useful one I have installed for customization is Ring Extender.
It allows me to assign any sound I have to my incoming text messages and notifications so I know who is texting me.
It does not show up as an app so there will not be an icon for it. To use it,
press menu/settings/sound and display/phone ringtone or notification ringtone. A pop up will ask what program to use, choose rings extended. You will have access to other ringtones, mp3 files, or sounds that you have on your SD Card.
If you have a 3rd party text like chompSMS, you will have to customize the sounds through that application.