Baby shower gift etiquette?

Quick question! My brother-in-law and his wife are expecting their first baby 5 weeks after we're expecting ours. My sister-in-law purchased gifts off of my registry, totaling x amount of dollars. I was looking at her registry today to get an idea of what to purchase my niece or nephew, and I started wondering about what kind of spending is appropriate in this kind of situation. Obviously I want to spend the same amount on her baby as she did on mine, but she and my brother-in-law are pretty well off whereas my husband and I are going through financially tight times. Should I suck it up and spend more money than I really have available to spend, or would it be appropriate to choose some lower dollar items off of her registry to go along with the baby blanket I already handmade for her?