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I'm facing a nurgle army in a week or so.. and I heard they are pretty tough to beat. I'm going to play space marines so any ideas on units that will be efficient ?
My list includes:
Librarian
Chaplain w/ Jump Pack
Sternguard
Tactical squads in Rhinos
2 Las Cannon Predators
Assault Marines

Any ideas? thanks in advance

Plasma Cannons on Sternguard and Tactical units, using Sternguard special ammo, and keep them, the enemy, at arm's length.

You might consider switching the Assault Marines for Vanguard with Power Weapons. Expensive, but with the extra attack (four attacks on the charge!) they'll make up for the 5+ to wound and defensive grenades, and deny both saving throws and Feel No Pain. Combine that with the Chaplain's Litanies of Battle and Fearless and you should do okay.

Use your Predators to knock them out of any transports they're riding in, and attached your Librarian to your Sternguard so that they can benefit from a Force Dome and something else.

That's what I'm going for with the preds. Taking out rhinos and defilers... I run my librarian with Force Dome and Gate Of Infinity so i can deep strike close to anything worth of shooting with my combi meltas/combi plasmas...

I like the idea of the Vanguard but that'l be a lot of arm switching n such... thanks tho, but do you think there is a better power for my librarian besides Gate Of Infinity ?

Not really, although the Vortex of Doom might be fun if you can pull it off. Kind of high risk though. It might be something to skimp on the Librarian and just use the one power at a time.

Have you considered a Terminator squad instead of the Assault Marines? Terminator squads can't execute a Sweeping Advance, but that's a wash if you're facing Plague Marines (and presumably two Lash Princes and Obliterators). If you take Terminators with a Cyclone then you can land two Instant Death shots plus ten bolter shots the turn you land, and then wade in to finish them off with Powerfists.

Low AP shots (ap 1/2), AP3 is good, but they still get FNP. As nurg said, plasma cannons rock, same with vindicators or anything str 8. Power weapons are also gems, try and take a fist on everything you can. And shoot, shoot, shoot. plague marines are tough for marines to kill in CC, you have far better chances shooting the hell outta em as they advance.

Ways to kill Plague Marines (that are easy to spam for Codex Marines)

1) Missile Launchers. I put this as #1 since you have LOTS of options to mount these and they do a great job of multi-tasking for Rhino killing. Remember he's T4(5) so S8 = no FnP.
2) Plasma/Meltaguns/Power Fist. I lumped these together because they are usually used in the same kind of squads and at the same range. Everything here is either AP2 or S8 (or both!). You want these to finish a squad off with, but not to do all the work because they'll be packing the same weapons up close and more of them.
3) Plasma Cannons/Multi-Melta/Demolisher. Both have extended range over their little brothers and both are flexible enough to be in most all-comers list. In the case of the Demolisher/Vindicator, you can put knock out entire squads with a little luck. The key will be to pop their transports at range to force them to foot slog.
4) TH/SS Terminators. Really isn't this your answer to everything?

Note: All of these work well as counters to some of the more common Chaos units like Oblits, Terminators and Daemon Princes.

Is that what your list is limited to in your OP? I have a few suggestions, but they don't involve m[any] of those models.