Good/worth Playing Xbox Games?, some questions for an old-school gamer Options

[EmeraldNite]

First post here, haven't really perused the forums either. Hi

So I'm starting to get back into the old Xbox because imo it should've had a longer shelf life. I just had some general questions before going to a retro gaming store soon.

First. What are some good games for this thing? Aside from like KotOR and the Halos, which I have. I'm not asking for like the must-haves so much as any game on the Xbox worth playing.

Second. This store also has the Halo 2 Collector's Edition. I have the standard H2 and am a Halo fan, so I must ask. Is it worth it to trade in my copy for the Collector's Edition? I've heard it's pretty cool but I dunno.

Thanks in advance for your opinions