The most obvious comparison for the BlackBerry Bold 9780 is the Bold 9700. The new Bold flagship is almost physically identical to its little brother, save for the improved camera, increased on-board memory and lightly tweaked exterior.
The real upgrade is the new BlackBerry 6 operating system, and we'd say any BB owners will find a significant evolutionary step from their current system. The new Home screen is very well thought-out, and the new browser could be worth the price of admission alone.
While three of these are touchscreen, and so offer a different experience to the Bold 9780, the HTC Desire Z features a landscape QWERTY keyboard.
However, our review found the build quality occasionally suspect and the battery life fairly disappointing. For those reasons, we doubt it will win over BB purists, but Android is extremely capable when it comes to messaging, so remains a viable alternative.
There is also, of course, the iPhone 4. While the slick nature of the iPhone's internet and media experience won many BB users over previously, BlackBerry 6's huge strides in these areas have narrowed the gap considerably.
However, BlackBerry App World is still far behind Apple's App Store when it comes to diversity and sheer quality in third-party applications.
It's also worth looking at the Nokia E5, which is the closest to the Bold 9780 in terms of form-factor (though is a generation behind in terms of software).