To back up the previous post, my blues playing lap and slide friends on Tyneside all use open G high bass (lo - hi, G,B,D,G,B,D) and occasionally retune (rarely more than 1 string!) for certain songs. I know of a couple of guys that prefer low bass D (D,A,D,F#,A,D) which you might just manage to get by retuning a G string set, although the bottom string may be rather slack. Start on G before you try alternatives is my advice too. Plenty string sets for G on offer, I prefer nickel to S/S (less "bright") but you'll need to find your own preference.
They all seem to prefer a Stevens (or spin-off) bar, so your choice of SP1 is right on the money for blues.
If you ever try lap steel other than blues you should go with a bullet nose bar and a 6th based (say - C6th or A6th) tuning.
One last thing, many of the guitars currently for sale have a Strat/Tele type bridge, if you has one, make sure all the saddles are straight across, right angle to the strings, and same height. Steel guitars don't need intonation adjustment and a piece of ordinary angle material is all that's really needed. The Strat bridge can be bought in cheap and easily, and saves a production run on "specials".
Enjoy your new journey with our best wishes