Almost all popular clematis varieties are suitable for a zone 6. You could pick one of the large flowered hybrids or pruning group 2 clems or you could pick a later blooming pruning group 3. Unless you have a specific cultivar in mind, I'd suggest you just pick out one you like at a local garden center or nursery.

Thank you! any tips for a beginer? do not prune?

Pruning group 3 clems tend to be less prone to clematis wilt. And be sure to read the Clematis FAQ's about digging generous planting holes and planting deeply.

Any group 2 or 3 from a local store would be fine. Group 1 tend to get really big and most garden centers usually don't carry them any way. At least where I live they don't.

Tips on how to grow them are abundant on this forum if you read some of the old posts. There are also a lot of beautiful pictures. I bought some great books on ebay for $4 each including shipping. There are a number of good sellers online such as Brushwood, Hummingbird Farm ( to me the roots are best from them), Donahue's - best price, small plants that need to be potted up and grown on before planting in the ground. There are others. Plants available at a place like Lowe's hardware tend to be a nice size with great roots and a good price. Those might be ready to go in the ground. Many of them lately have been the patio or pottable types by Raymond Evison. Cezanne is pretty. Some seem a little lacking in vigor. At least you are apt to see them in bloom. Walmart has some decent plants but at my local store they neglect to include labels so you don't know what you're getting. It's as if they think Walmart shoppers don't care what they're getting or don't read labels. Anyway some of the type 2 pruning group wilt so to play it safe on your first clem a type 3 pruning group could be easier. I think they're tougher but can get pretty big. Look up viticellas. Smaller blooms but lots of them. Is there a particular color you're leaning towards?

Here is a link to the Clematis FAQ: https://www.gardenweb.com/discussions/clematis-faq

And not all type 1 clematis get big - some are quite compact - but they flower quite early in the season and then are done for the year. Since their bloom period is so early, they can be subject to damage from late spring frosts.

Patience is a virtue with clems :-)) They are frequently slow to establish and seldom put on a good show until 3-5 years in the ground.

For color, likely pirple, unless there are any blues?