First, thanks for responding. I'm not making fun of you, I'm genuinely curious what motivates somebody to make a jump on a year old device. Bear in mind, everything else below is just my opinion on why your reasons don't sway me to do the same.
Technologically, I'm dubious that higher resolution than the current really good level is going to matter. Yes, I'm sure it'll look nice, but I can read eBooks just fine on my iPad1. It'd be great if you could post back with a comparison of the two when you upgrade and give it a serious consideration of "is text reading really that much better".
On 4g, that does sound more like a commercial endorsement

As a side note, the 3g speed on the iPhone 4s was faster in tests than the other 4g Carriers. Part of this is because the range of speeds capable by 3g and 4g as defined by their carriers and enabled by technology upgrades had overlap. Basically, being 4g is no indicator of actual speed or being faster than a given 3g segment of network.
That's also trumped by WiFi. Which is more likely to be throttled by the ISP the WiFi is hooked up to than the WiFi protocol (802.11b is 11Mb/s speed. Residential DSL/Cable is just finally catching up to that). At Starbucks, yes your 4g signal will probably be faster than whatever minimalistic connection they provide. At home, maybe not. At work, if you are at a big enough corporation, most likely not.
I'm leary of paying another $30/month or so for a data plan on an iPad. I already have to pay for my iPhone (two of them!). I do have a MiFi from work, and that's a better solution than the USB wireless modem I used to carry for my laptop, because all the doohickeys I carry can use the MiFi for the price of one subscription. A MiFi is about $10 cheaper per month than the USB doohickey (whose proper name I can't recall so early in the morning).
I have no doubt the iPad3 will be nice. And having internet anywhere is a no-brainer for niceness. Is it so much better that everybody should upgrade from an iPad2? I'm not so sure.
Side question for GreenLantern: what do you plan to do with the iPad2? Sell it or pass it on to somebody else, or let it sit on your shelf of last year's technology?
I think options 1 or 2 let it see more use, retaining its value. Buying an iPad3 and letting the iPad2 collect dust is where the expense gets compounded.