Oh, I wouldn't even think about getting a Playbook now that the Nexus 7 is here. The Nexus 7 is FAR superior in my opinion. First off with the Nexus 7 you have access to literally HUNDREDS OF THOUSANDS of Android apps. The app selection on the Playbook is far more limited. You can find a whole bunch of different programs that can do what you're wanting as far as working with Microsoft Word, Excel and Powerpoint documents and more for the Nexus 7. You can then easily attach them to email via gmail or any other email you access through the browser.
Some of the more popular 'office suite' type programs that allow you to edit word and other MS Office docs are 'QuickOffice Pro' and 'Documents To Go'. I'll provide links here in the Google Play Store:https://play.google.com/store/apps/details?id=com.dataviz.docstogo&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5kYXRhdml6LmRvY3N0b2dvIl0.https://play.google.com/store/apps/details?id=com.qo.android.am3&feature=related_apps#?t=W251bGwsMSwxLDEwOSwiY29tLnFvLmFuZHJvaWQuYW0zIl0.
There are so many more actually available I'd browse through the App catalog at http://play.google.com
Also, the 'Chrome' web browser on the Nexus 7 is probably the best browser in the mobile space right now. It should be able to do anything that the Playbook browser does and more.
Without going into too much detail the hardware of the Nexus 7 is far superior to that of the Playbook. The processor is more powerful 'Tegra 3 quad core vs. dual core' and the screen is better '1280 x 800 IPS vs 1024 x 600 non-IPS'. The Operating Software on the Nexus 7 is also the brand new Android 4.1, Jelly Bean while the Playbook works on the proprietary 'Blackberry Tablet OS' which while having good security features has only a small fraction of the apps available that Google does. The Playbook does have a 'compatibility mode' where it can use Android apps but to be honest I'm not sure what the limitations are of that.
There are a couple of things that the Blackberry Playbook does have over the Nexus 7 such as the option for more memory on the tablet itself (they offer 16gb, 32gb and 64gb versions) and a back camera. Also, if you're working with a company's IT department and if they have very specific reasons why they want to use the Blackberry Tablet such as custom software they've installed etc, that might of course force you to go that direction.
In my opinion, however....if the choice is purely up to you...then there are so many advantages to having the Nexus 7, especially in that the OS is always going to be the latest and greatest and have Google support...which is a rock-solid company compared to RIM which could be out of business in 6 months, that I wouldn't even consider ponying up for a Playbook right now unless your company is forcing it on you. It's not that it's a 'bad' tablet...it's just that the Nexus 7 is going to be so much more viable for the next few years in both of terms of hardware and software...not to mention it's cheaper to boot!