I've been looking at Tunas myself today.
The one thing I would say against the Heimdallr 6105 is the lume pip at 12 on the bezel, it's pretty horrible.
I've not got a bracelet for either of mine, both are on silicon straps (both are pretty good I think, especially the one on my new Marinemaster), but I've heard they are a bit shonky.
M