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Hmm, in your position, I'd be sorely tempted to go with the FW option. Three packs o the SM HW set is about $45 (going by uk prices at least), so it's actually not much more than three metal dudes, but you get posable resin parts which are also much lighter and so not prone to all the various issues metal models have. You'd also get three each of the Heavy Bolter, Lascannon and Plasma Cannon, plus twelve "Heavy Weapons" backpacks which might be ideal for differentiating a potential Devastator squad or just the Heavy Weapons guys - your choice. All the parts are gorgeous sculps, and I'm sure you've got a few spare marines lying around to use them with.
On top of that, IDK if you've bought anything from FW before, but if you haven't this is a great opportunity to get acquainted to their stuff with a relatively cheap and simple kit. Oh and did I mention how ing awesome they look?
http://www.forgeworld.co.uk/Warhammer-40000/Space_Marines/Space_Marine-Infantry-and-Accessories/SPACE_MARINE_HEAVY_WEAPONS_SET.html


EDIT: ...too late. Next time!

...It's not too late to grab the FW stuff and use them to spice up your standard squads a little . That way, if you use them as devs, the units are more interesting, and you get some extra weapons to throw into Tac squads if you want. IDK, I just feel like it would be kinda awesome to see a mix of different 'marks' of heavy weapon among the squads...