Time to Frame

This weekend I need to start looking for some frames for my exhibition work. I am printing a main part of my work myself; on B/W pearl photo paper; and then framing them all in a style of box frames. Eventually making up a grid of around 3 images tall by 4 images wide. I think the frames need to be of a kind of black or dark wood affect; with the width that brings them out from the wall.
Perhaps something like this?

This is from a particular company called 'Framed London Prints'.
Or perhaps I should go for something a little slimmer like the frames from 'Best4Frames'

I like the idea of the images being brought out of the wall so I think the wider the better; I just now need to find a reasonable source to get the frames and wether to go for dark brown or full black. I also need to see about mounts and whether the images work with the paper being full bleed with just the frame around them; or to use the mounts inside the frames? This would however minimise the amount of the image you would see; and any frames larger than A3 would take up a lot of space in the gallery.