tdb,
You're answers in context below.
"I have been looking at Hornadys L N L AP press, will the L N L press and Hornady die set give me the great rounds I got with the 550"
Yes, though a lot of the quality depends on you doing a good job of reloading by setting the press, regardless of brand, up correctly and using a good combination of components.
"I see the L N L seats and crimps at the same station, which the 550 is in separate stations will this make a difference in the round.
The seating and crimping isn't controlled by the "station," but rather, is controlled by the dies that you use. You can combine seating and crimping using one die or you can separate seating and crimping into two stations.
"What dies set would be best for this set up,I will using H335 powder , Winchester primers , winchester cases ,and if I get the L N L hornady 55 SP bullets."
Since I don't know what caliber you're reloading for, I can't suggest a die set. That said, I have used most all brands and gotten good results. With the Hornady, you can remove any die individually to clean it, so brand of die doesn't matter much. I use Hornady, Lee and RCBS dies in my Lock N Load press. I've begun to buy many more Lee sets and supplement the Lee dies with specific application dies from other companies.
That said, your questions indicate you need to buy a book or two on reloading or check them out at your local library so you know a bit more about the reloading process. There is a sticky at the top of the forum for newbie reloaders. It lists several books. I suggest you acquire the first two and read them before you go much further, so you understand the reloading process better.
"Have done a few searches , still dont know which way to go."
Not sure what you're talking about relative to which way to go, but the Lock N Load is more comparable to a 650 than a 550, if that's what you're talking about.
"I don't know enough about the L N L to know what it does , in there ad they say the press seats and crimps at the same station ,can you do this at separate stations on the L N L press with the hornady die set , if so which die set would I need?"
I think before you go any further, you need to do some reading, so you understand the process better and can make better informed decisions. The books above will help you with this. Otherwise, you're flying blind and folk's recommendations won't make a lot of sense. Read the sticky for beginner reloaders, acquire those books, read them and then you'll be ready to ask more questions and understand the answers you get better.
Regards,
Dave