bazza
For windows tablets , few options
1. tablet only
1.1 touchscreen or keyboard
1.2 touchscreen ,keyboard and pen input
microsoft surface , acer, lenovo , samsung, asus, hp ,dell etc
2. convertible - like a normal latop but can be folded and screen works as a tablet
dell, fujitsu, acer ,lenovo , asus etc
eg lenovo twist ,ASUS TAICHI
plain no frills laptop is going to be cheaper than a tablet by at least $500 -1000
Tablet with pen is great (I used an older fujitsu model st5011 from 2004 - 2010)
but more expensive
Tablet with touchscreen is a bit cheaper(should be)
New model surface pro is announced but not out yet. avoid surface and surface rt as they won't run standard windows programs. Only surface pro can.
Can get reasonable laptops from $500
can get cheaper but you'll need to upgrade the ram
eg
http://www.msy.com.au/Parts/notebook.pdf
(note they are really annoying to deal with on warranty stuff)
Look for an i5 and at least 4GB ram, 8GB if you can fit it in your budget
an extra 4GB sodimm is approx $40-55 .
I3's are okay but can be a bit weak if you need a bit of processing power.
I'd like to get a surface pro 2 when they are available. tablet with pen input and onenote is awesome for note taking/meetings , quick diagrams, sketches etc
Also easier to use than a touchscreen when not sitting down