BB Curve 83xx :: Won't Use Apps As Memory Space Is Low

I have a BlackBerry 8330 and I am having problems with my SprintTV, NFL Mobile Live App, etc where I cannot watch any video or audio from those apps. I took it into a Sprint Tech Store, and they thought that maybe it was becuase I either had an after market App that was interfereing with the audio/video feeds, or that I was simply using too much memory and it was interfereing with the audio/video. Tehy couldn't tell me where to look for the Device Memory and had no idea how much it came with out of the box and how much I was using.

I need to know how much Device Memory comes on a BB 8330, where to look in my BB to find out how much I'm using, and need to know if there are any suggestions or tricks I can perform to free some up without deleting too many apps (if that's even possible). From the other forum answers I've read, I don't think there's a way to free space without deleting content. I see Device Memory in my Options, but it only says:
File Free: 27080648 Bytes

Is that a lot left, or is that close to being depleted? Is that actually the Device Memory, or is that something else? There's nowhere that tells me how much I started with.