Weddingbee boards

Just looking for a gift suggestion.  My sister-in-law got married at a small destination wedding in July.  We went, and gave her a gift - my husband was in charge - and all he got her was a bottle of wine.  (semi-pertinent info - this is her second wedding).  Now her parent's are throwing her a "celebration" so they can invite their friends. 

So - what should we get them?  I thought our first gift was not enough - like I said I let my husband control.  I'm thinking a card and a check. Should it be semi-equivalent to what I would have written for the wedding?  I know my husband would say "nothing" - he's not mean he's just horrible at gifts (personal experience)...

Thoughts?