Without knowing where you are located, it would be difficult to recommend a specific species. The PNW, with its cool summers require an early variety. The hot/humid south has varieties that do well there.
I do NOT recommend Amish Paste, as they are too watery for a paste type tomato. You need too many, and they take a long time to render down. Most "Romas" are considered "Paste" tomatoes, but most are lacking a true tomato flavor unless rendered down into a thick paste.
An excellent choice for a flavorful canning/paste type (that also makes a very good salad tomato) would be the "
Opalka". It is an heirloom from Poland that has exceptional flavor, and very vigorous plants. It is a high yielder in most zones.
For the world's largest, most complete database of heirloom tomatoes, go here: http://t.tatianastomatobase.com:88/wiki/Category:Tomato_Variety_List Tatiana has worked for years developing the database. She offers many of the varieties herself, but also provides links to other reputable vendors. The site is a "must" for anybody looking to compare heirloom tomatoes. Since she is from the former USSR, she has more Russian varieties available than anybody else. She is honest and fair (she is also in BC, Canada which makes it easier for Canadians ordering).
Good luck...enough canned tomatoes to make it through until next year's harvest is an essential part of homesteading.
Many of the "San Marzano" varieties are also very popular, and productive.