I have the tf300t and find it a very cpable device. I was considering the TF700 but a few issues related to running Android have me forced to wait until the Win8 Pro tablets come out early in 2013.
Despite those issues my nifty tf300 is fantastically capable. Love the keyboard dock which allows me to use it for actual work. I am underwhelmed with the status quo of Android devices when it comes to color(s), access to color correction settings--especially gamma--but I can still do 90% of all my admin work, email, web browsing and what have you.
I forget the model number for the Asus Win8 devices but I will be one of those waiting to see what we get from them. Do be aware that the quality control of the tf300 was, well, less than optimal. Mine is fine though it has a couple kinda odd smudges on the display which are only visible when I clean the screen. Others report various issues. I some are valid and others make me raise an eyebrow.
One really useful site for me was:
http://www.transformerforums.com
Nice folks there and fairly decent info on all the Asus Transformers.
Enjoy whatever Transformer y choose. I do not believe any are bad. I saw some really nice deals on both the tf101 as well as the tf201 in recent weeks. You really are not giving up much and if you can get a tf201 refurb for $200 (yes, I saw a deal for the 32gb version for just 200-bones!) I say for the $325 or so it would cost with a dock it would be hard to pass on even with the Wifi and GPS issues.
Be aware though if you need good control over display settings, in general, Android is not great. You won't get control afforded you on Windows box. Hopefully Win8 Pro addresses that area which I need.