Achaicus
|
Having one Arcanist level would would (approximately) double your reservoir size as increase your spells known to just over double.
It seems to me that it is perhaps part of the "age old question" of whether multi-classing is more powerful not..
that's how I see this approach..
..more powerful in lower tier but it might "catch up" with you when you are at a higher level (and might then like having one more spell level sooner).
An alternative is to take the Extra Reservoir Feat.
http://paizo.com/pathfinderRPG/prd/advancedClassGuide/feats.html#extra-rese rvoir