Thanks, for all the responses...
Regarding rockbox, I can't seem to find anywhere where it is supported for a 4g touch. Also my ipod is still a virgin and is not jailbroken, yet.
I'll have to look into the EQu when I get home.
Regarding he cowon. I understand the price point is similar to most good amps. And I also understand its slimmer and a all in one package, as you explain it.
But... I want to use the ipod, because its new and was a gift for my birthday. Also the argument that its slimmer and a amp is bulky carries no weight to me, due to the fact I keep my headphones, cords, ipod in the ultrasones velvet carry bag in my backpack. So it doesn't really matter. Also, I feel a good amp will be able to grow with me and my future purchases. I.e. laptop/desktop listening, portable gaming, and any forseeable headphone listening I could possibly do, whereas the cowon would only be good to listen to my music in a portable sense.
So far the only suggestion I've seen regarding a amp for what I have is the cmoy 2.03, and someone else listed off several such as a ibasso toucan. What amp can I get that will get me a lot of bass now, but also grow with me for future use? I like to buy things once.