Looks like the Starblast 6 comes with
a 10mm Plossl and a 25mm Plossl.
Those Sirius Plossls have extra blacking and a field width
of 53 degrees. An ES 52-deg moght be a hair better,
but it would usually be tough to tell.
A good Barlow could do a lot with 10mm and 25mm.
You might find the eye placement of the Expanse to be a bit annoying..
The Paradigm(or)Starguider Dual-ED or one of those nice HD-60s above
would be a comfortable bigger view.
.At the low-fl range, however, it's hard to know which one special power is right...
....you would end up getting multiples ($$).
because.....all kinds of ranges and sizes of targets are out there!
This is where the Barlow can help. Even the shorties from Orion, Meade, or GSO
are very nice and quiet now, and you can use the optical cell for
1.5x screw-on or 2.0x with-body.