A pity you didn't go the 4500H as that would still give you enough line I reckon. Weight is the only issue though. A lot of rods here will do the job.
The T curve bluewater spin rods are good, probably the 10 to 15 kilo insteead of the 15 to 24 kilo may suit but that depends on drag settigns. Borth are good rods though.
I run my 50lb spin reel through a custom samurai NV9 blank. It's awesome and perfect for 50 lb braid and the type of fishing you are looking to do.
Ray and Annes tackle have great deals on Monstermesh rods right now, 179 delivered I think. Can't go wrong at that price. If they have a long one (7 foot) for throwing slugs it's tempting!
Fin Nor do an Ahab rod that is also quite nice for this although I think the 4500 size would have suited this rod a bit better. There's also an ugly stick bluewater spin rod that will be the right length for this, can't remember the model number but should set you back less than 200 bucks and still do the job.
That should get you started!