Im not sure which one you mean as the standard.
ATM the most 'plain' Bostons are the Joy Boston or the Vintage Bostons but the Soho Boston and others are also elegant and simple in shape.
I have a Joy, in Gucci Plus material (coated canvas) and the bag lives up to its name. There is also a vinyl imprime version with leather trim. The Joy is like a Speedy but with leather running all the way all around and measures 32cm across rather than 30cm.
There is a Joy Boston Club thread that you might like to browse
The Joy Boston Club~!*~!*~!*~!*~!*~!*~!
For me it makes a really good 'standard' bag, very durable and easy to use.
The vintage Boston whether they have web-stripes or not are either leather or original canvas, all models have a detachable shoulder strap which is a great optional extra but also raises the price a bit.