If portability and being on location is your BIGGEST concern then by all means the Yammie/Akai is the move. The PC will allow you much much more in terms of flexibility though. It will be more powerful and more modular.
Lets look at a comparable PC setup
The PC if you roll your own can cost as low as $800 w/rackmount case and a light weight 15in LCD flat screen monitor. Get a Delta 1010 ($550) and
an Alesis Studio 12R mixer ($350) Add the cost of Cakewalk Home Studio 2002 ($100) and you have a flexible multitrack (30-40?) solution that can use up to 16 efx. Far more tracks or efx than either of the Box units. 8 preamps with XLR and phantom pwr and a hardware mixer. The price? $1800
Swap the 1010 for something like a Aardvark Q10 and you have 8 inputs and preamps in one rack space. ($700) The difference is you will have to rely on low latency driver from Aardvark to do monitor with efx in Cakewalk. The Price? $1600. Add a hundred or two for SONAR to get unlimited efx (all that your system can handle) and it jumps up to around $1800 again.
It can be done......I plan on using a PC setup for home and location recording and am doing research to this end. My budget is a lil higher than yours though ;o) I have my setup pretty much mapped out. After working with a computer setup I dont ever plan to go to a standalone box only. I have a gazillion plugins......and a vst plug in wrapper so many of them were free.
Id have to spend at least $10,000 dollars to do the things I do in my puter with hardware only. Mannnnn and then you STILL have to look at itty bitty screens most of the time. LOL. No thanks.
Given the budget and a lot of location work.....sure gimmie
a Tascam MX2424 and a few Presonus Digimaxes. Less hassle and no monitor and keyboard to fumble with. When I get home though....I would pop out that drive and transfer the files to my PC. Hardware boxes can be very intuitive and simple to deal with
but they dont offer near the flexibility as my Duron 850.
Warning.....if you dont like to fumble with puters and arent willing to spend a few weeks tweaking your puter for performance and reliability then its probably not for you. Im at home working with computers and have built all my DAW's so it wasnt a problem for me. You must shell out the cash for quality components for it to be stable though. Dont skimp you will be sorry. You will then join the group of folks who think PC's are trash for recording.
Peace