Some guys told me 7730 is not as good as 7290 as the system or hardware of 7730 is not stable. But I like the large screen. Anybody can give me your suggestion? Many thanks

The 7730 has only 16Mb of Ram + 2Mb Flash RAM. While this is sufficient to run version 4.x firmware with full wireless synchronization, it's a bit of a squeeze. At my firm, we recommend upgrading devices with less than 16Mb of RAM as they tend to retain very little email.
The Blackberry site has a device comparison page. Go to http://www.blackberry.com/compare/ to compare.

Go to http://www.blackberry.com/products/handhelds/index.shtml for a list of product.

When you select a model, click Handheld Specifications for technical details of the device.

Aside from the RAM issue, the 7730 appears to only be available through T-Mobile.


J

I'm back to using my 7780 after trying a 7100g (tried to make myself get used to SureType but it didn't work out for me).

My experience with my 7780 has been so-so. The big screeen is great, the keyboard is very easy to use, but the thing is slow and the small amount of memory doesn't help. Don't expect to install much in the way of third party apps on one of these.

One nagging problem I've been having is the email folders are always getting screwed up at some point. Mine is tied to BES and I use the Web Client to get emails from one of my personal accounts, and at some point something goes whacky with the email folders. One time I had Web Client mail arriving to the device and while it was showing up on the main Messages screen and was readable from there, if I went to the Inbox folder under WebClient that folder was empty. That happened a couple times. When I switched back from the 7100g I wiped the device, installed the latest internal OS, did an activation, and things were fine for a while but now the Desktop folders are missing. Desktop mail from BES appears on the main Messages screen, is readable from there, but go to "View Folders" and all of the Desktop folders are gone.

I've put in a request for an 8700c, so at this point I'm putting up with the 7780 until I get the new one.

In your case I'd go with the 7290 if you cannot get a 8700.