Depending on your toy level and what you and your partner are comfortable with, seeing how you already have a tickler and blindfold, maybe trying some type of external vibe, such as a bullet or clit vibe. If you're both comfortable with anal, starting with a plug would also be a good next toy.
Maybe the next toy could even be a penis or masturbation sleeve. The Mood Pleaser collection by Doc Johnson is wonderful, right now EF only carries 2 out of the 4 in the collection, but my husbands favorite is the Mood Pleaser Massage Beads
. Or the Sue Johanson's Super Head Honcho
is another great one.
Whatever you finally do choose, just make sure it's something both you and your wife are comfortable getting/trying, nothing like breaking the mood by bringing in unwanted toys.