Deals and Bargains forum: For portable productivity, Kindle Fire HD, laptop, or tablet

I currently own a Samsung Focus (bought when the Windows Phone first came out). It was my first Smartphone. Primarily I wanted to connect my work email and contacts (Outlook). I had to pay an extra $15 to AT&T; even though I don't use the internet much on the phone (I rarely go up to the monthly 250mb; it averages about 80mb a month). I also own a Kindle Fire (bought in December 2011) which I love. I've reviewed the new WIFI Kindle Fire HD (about $369 for the 32gb). If it's possible for me to connect my work email (Outlook Exchange) and view PDF and Word documents that I send myself in email; then I find it unnecessary to get another Smartphone. I find it more expedient to get the newer Kindle Fire HD and get just a regular phone (not a Smartphone) and thus save the $15 a month (which that $150 a year could go to the price of my buying the newer Kindle Fire HD).
The Kindle Fire HD also has the same feature as my recent Kindle Fire. I can access my weekend travel plans, the latest office report - keep my essential information close at hand and backed up on the cloud. Email spreadsheets, PDFs, Word docs and more directly to my device or upload from my PC using Amazon Cloud Drive. Kindle Fire HD features full support for Exchange-based accounts making it easy to stay connected when you step away from the office. I think it would be more expedient to go this route. I had just bought an ASUS all-in-one pc (24 inch screen) after taking back an ASUS laptop (my HP laptop had died and my husband's pc was dead; so we're sharing the PC although I'm the one uses it the most - 95% of the time). My husband agreed that I could get another laptop once the PC is paid off. I was thinking that getting the Kindle Fire HD would be the best purchase all around; since it has the features I want and is portable. That being said, I wonder if I should I keep my original Kindle Fire purchased back in December and go for getting a laptop (or a tablet - which might be more portable - and not get something with a ton of memory - after all, it's just a way to be productive when I'm away from home and work) after I've paid off the ASUS all-in-one PC? And still get just a regular cell phone (not Smartphone).