I don't know how you came up the $105 for conversion on the LNL but your way off.. That is more of what Dillon Charges. Hornady cost is just the bushing where you can 10 for $45.
I've owned a LNL-AP coming up on 9 yrs now, still going strong. They both have their twerks. With Dillon you have to be extremely careful of plastic parts wearing out which can cause primer detonation. This is a know design flaw for at least 4 decades and they still have not come out with a fix. Hornady is constantly improving their equipment. As know flaws show up, they address the problem and correct it. Dillon just keeps sending the same parts that keep failing. Now with that said. Dillon has a better setup when it comes to the case feeder. The 650 was designed around it so you should go that way. The LNL-AP is design to use or not your choice. I have one on mine and it can be touchy to get right. What I have found is the way Hornady says to adj it I have more issues. I've learned what it like and have very little problem. Like any thing mechanical if every thing is set right they work smooth. If you have NO Mechanical Ability I would shy away from any AP press.
They both have a good warranty, lifetime.
It depends on how you do your conversions -as cheap as possible or as quick as possible - Right?
I have mine set up so that each caliber is self contained so to speak (other than the Powder measure itself, which I have just one of)
For a conversion I use:
1.) Quick change powder die $29 (this along with the PTX insert establishes the flare in the case, so I have one for each conversion already set to the correct depth for the cartridge)
2.) PTX insert $11 - powder through expander insert for PM. Caliber specific.
3.) Bushings $22 - need at least 4 depending on how you do things ($4-$6 ea. depending on how many you buy at a time).
4.) Powder Measure Stop linkage $8 - insures repeatability on the case flair
5.) Powder Measure insert $11. I keep one of these set for each caliber so I don't have to go through the whole dial in a drop thing. A micrometer insert would be better if you're going to use the same insert (@ 3 x the cost.)
6.) Shell plate $34.
$115 (prices from Midway, rounded off.)
If you want to go even faster add a bullet feeder die to the above.
When I set up to run a different caliber , I take everything off and install the whole works all set up and ready to go, no adjustments needed. A couple drops to verify powder charge, and go. Takes under 5 minutes.
To go as cheap as possible you can do away with a lot of this stuff- but then you have to set everything up for every caliber every time.