I don't really enjoy any of the VS level for sipping. I use Hennessy VS for my cooking brandy. Remy VSOP is the lowest I would drink, but I mainly use that as cooking brandy as well. When cooking, they infuse quite a nice aroma to anything that stews for a while.
Generally, the lowest level I find acceptable to drink is the XO level. Below the XO level, I find the flavors to be a bit too bright and disjointed. Also, not as smooth and do not pair as well with desserts. I prefer Courvoisier XO to Hennessy XO and Remy XO, I like its aroma better and the flavor is nicer to me, seems smoother as well. Pretty awesome that Courvoisier XO is the least expensive of the main three as well ($90).
For mixing, Hennessy VS should be fine. I think it is 18$ for a 750mL.
Currently saving up for a Louis XIII Remy. Unfortunately, the price has doubled in the last 5 years. I tried some on my birthday a month ago and it was an amazing experience. It isn't for everybody, but once you work your palette up through the various levels and learn to nose and taste them, they are quite wonderful digestifs. I haven't had the chance to try courvoisier l'esprit or Richard Hennessy yet, but I intend to.