Mine is a Carradice
http://www.carradice.co.uk/handlebar-bags/super-c-frontbag-klickfix.shtml quality and it is very durable and waterproof.
It is quite large though which is good (for obvious reasons) and bad (affects the handling slightly when loaded and I would not like to ride hands free). It is pricey but the red version fades to a nice pinky crimson colour. The map case is only OK but I have a very good Ortlieb map case which fits instead.
Size of bag is one of the key things to think about AND does it fit your bars obviously. Is it just for valuables and will be used with rear panniers or is it for sole use alone.
The attachable map facility is very useful, if you like maps and tour a lot.
If you only want it for storage, I'd be tempted to get a bag to mount on the saddle or on a rack as these affect handling much less if at all.