advice please =)

[anything you synth]

Hey everyone. I'm new to the forum, but have been reading a lot lately, as my interest in photography has grown. Right now, photography is just a hobby, but I'd really like to take it to the next level. I have a 35mm Canon Rebel, and recently bought a Lomo Holga (just for fun shots), but I'm considering buying a nice digital SLR such as the XSI or XTI. Whether I persue photography as a career or not, I think I would enjoy having a nice camera. any input would be greatly appreciated.

thanks in advance!