Like everyone else is saying, wait until E3. There is a good chance they will announce new bundles or price drops or a new model. Then you can decide if you want to wait or not.
I would also recommend a PSP-3000 because you can still buy everything digitally like on a PSPGo, or on UMD. If you get a PSPGo, you would get a smaller, more portable system with built-in memory and the ability to pause your system (by sliding it closed), but you obviously lose the ability to use UMDs.
Go to a local BestBuy (or another retailer of your choice) and try out the display models to see which one you think is more comfortable in your hands.







