Lano Gatto Feeling comparable to?

I am going to attempt a cardigan out of the Knit 2 together book. The pattern calls for 11 balls of Lana Gatto Feeling, which as some of you know is quite pricey! While at the yarn shop they had DK Cashsoft which looks and feels comparable and the guage is close (Lana 5.75 on US6, cashsoft 5.5 on US6). My fear is last time a did a pattern without using the same yarn it turned out lets just say, less than perfect! (See Tank Top topic) Any suggestions would be helpful.