Unless I'm mistaken your 64GB Touch has a very fast processor, comparable to the iPhone 3GS. So you're probably already on iOS 4 and very familiar with it. iPhone 4, as you know, is your Touch with a moderately faster processor, a mind-blowing display, a phone and a very nice camera. Unless iOS annoys you for some reason my advice is to sell the touch (and live with a smaller music collection on the go) and take the iP4 plunge. Since you haven't done this yet it seems like something about this choice is bothering you. If it's the antenna and the proximity sensor, go for it and remember that 30 day guarantee. I run my phone naked and don't suffer from reception issues. The proximity issue is very annoying but I am confident Apple will fix it soon.
I switched from Blackberry+iPod to iPhone two years ago. While I have been watching Android with interest my experience has been such that I've never been tempted to consider a switch.
Yep, 3rd gen Touch has faster processor, 256MB RAM, etc. Quite fast. Still on 3.1.2 though as 4.0 is not jailbroken yet. And yes, all the issues that have been reported (hyped up or not) are what initially kept me from ordering. And now there's an extremely viable Android competitor on AT&T that looks very appealing for many reasons. I know I can return them in a couple weeks (heck I could try both of them for 2 weeks each) but I just want to buy something and stick with it. Sure, the Captivate isn't perfect, but I WILL NOT be content with sitting around waiting for a fix for a jacked up proximity sensor that may not come. And if they can do it with software, I don't understand why it hasn't been done yet. Doesn't seem like it should be that hard to tweak a couple of sensitivity settings.
Anyway, I'm not going to buy an iPhone until they at least fix the proximity sensor, and an untethered 4.0 jailbreak is well on its way. I guess I could live with a bumper to alleviate reception issues.
By the time that's all fixed and ready, there will likely be updates out for the Captivate fixing some of its initial issues, so then I'll be back to where I started, lol.