Somebody mentioned it earlier, but "light weight" needs to be defined. Is that 7lbs scoped, 6.5 scoped, 6 scoped, etc...

The Montana and Forbes are the obvious true off the shelf lightweights if that is what you want. There are a lot of differences between the two so weigh out what matters/doesn't matter to you on that. The big ones that stick out to me are:

Montana: controlled round feed, more open grip, no cheekpiece, slightly lighter barrel, slightly heavier stock, bedded to a slave action, barrel free floated

Forbes: push feed, more closed grip, cheekpiece, slightly heavier barrel, slightly lighter stock, bedded to the specific action, full length bedded, 3" mag box

I like them both. Needs to be realized from the start that any of them can have problems, they are off the shelf rifles not customs. I've no problem tweaking little things. Got lots of great options...pick what matters most to you.