I have a 1588 - it works brilliantly. I have been using this model for over two years. I do hatch in an LG forced air. I do multiple hatches so I have two incubators.
I had no luck with the LG still air - the temperature spikes killed several of my hatches.
I paid about 150 for the 1588 with a turner. I know they have deals that you can buy them cheaper if you shop around.
I use a turner. I think it makes my life easier. Although I know folks don't use them and do just fine hatching.
Brinsea has an online sale right now for a very economical 10 egg incubator, the Mini Eco. No automatic turner. $65.00 If you want an automatic turner, try the Brinsea Mini Advance, but it only holds 7 eggs. Also on sale, for $120.00 right now.
$300.00 for a 24 egg incubator, 70 bucks off regular price. Octogon 20 Advance.
I just successfully hatched 6 of 7 eggs with a Brinsea Mini Advance - and it was my very first try at incubation!