I use UK army pro boots - they are lovely soft leather, gortex and thermalite lined - and the soles are very quiet when walking.
In the shops they cost about £60 - £70 (ive even seen them advertised for £100) but you can get them brand new on eblag from ex soldiers for £25.
I got a pair of these and a pair of the normal combat boots for £35 off one fella and they've last a couple of years so far.
They are very underated in my opinion, ive had hillmasters and various hiking brands and the pro boots are easily as good quality but require less breaking in and are quieter in use.
http://www.surplusandadventure.com/...boots/british-army-breathable-pro-399698.html
Daemon