2 units of 20 Saurus with a 5+ ward save from the Engine is a tough nut to crack! I do agree though that your Slann is a little tooled up for a 2,000 pt game. Taking off 2 of the disciplines and the Divine Palanquin would give you enough points for 2 units of 10 Skink skirmishers for your flanks, or a block of Skinks for an additional unit. A lot of people don't like Cold One Cavalry but I haven't had horrible luck with them. They hit hard and have great armor, and without Skinks are going to be your flankers in this list.
I try and step up my Slann based on the points limit of the list. At 2,000 I usually have just one discipline... maybe 2 without addition magic items. Basically I try not to spend more than 325 points on him. A "bare bones" Slann is still a force to be dealt with, and if I only choose one discipline it's usually Focused Rumination for the addition power dice, and then I slap on the Plaque of Tepok so he knows 5 spells, insuring I get all but 2 of any lore. You usually get to pick a couple as well, it's hard to roll 5 dice and not have at least one repeat (although possible). I've found this Slann to be more than enough at 2,000pts, and it leaves me enough points left over for more units. Also, if you plan on taking Lore of Life you really don't need the Cupped Hands, unless you take pleasure in handed over a nasty miscast to your opponent

In general though I've found the buffs from Lore of Light to be more useful than Lore of Life personally, but it's up to you.