I cant help as far as specific recommendations for rigging supplies are concerned, but for what its worth, if you are looking to save some money and happy to do some work yourself then you could do as I did; have the yard unstep the mast - theres no great technique or skill required in doing that, any yard should be happy to de-tension the rigging and unstep.
Then strip the old rigging yourself. This is an excellent opportunity to remove the spreaders, clean them, look at the roots and so on, as well as any other re-wiring or changes you might want to make wth lights, radio antenna etc. Don't forget to have a good look at the sheaves in the masthead and see if they are cracked or the central holes have elongated and replace if needed.
Package up rigging and send off to your chosen supplier to return to you, like for like. Attach the rigging to the mast and then engage professional riggers to re-step and tension it all up correctly.
Whilst the mast in unstepped you might also want to look at the step itself, remove it and the compression post and rebed if necessary.
Hope that helps