I am currently using 6 oz cloth and Raka 127 resin with equal parts 606 and
610 hardener on my Guillemot "L".

I am quite pleased with it so far. Wet out is easy beacause it is quite
low viscosity. Working time is no problem, and I like being able to vary the
ratio of fast to slow hardener to suit the requirements of the job.
I haven't seen any blush yet, even with a fairly high proportion of fast
hardener in the mix. That is probably due to the relatively dry climate here.

I've used MAS in the past, and had no complaints with it. Raka seems equally
good, though, so I'll probably stick with it because of the price difference.

I can't comment on Raka's 5 oz cloth or US Composites epoxy, since I've never
used them.