I have the Democrats picking up Nevada, Arizona, and Texas, but the Republicans picking up Montana, West Virginia, Missouri, North Dakota, Indiana, and Wisconsin, giving them a 55 seat majority.
On the other hand, I have the Democrats regaining control of the House of Representaitves due to the unpopularity of the Trump Administration and dissatisfaction with the record of House Republicans. At the minimum, I see the Democrats picking up 30 House seats (mostly from states such as California, New York, and New Jersey), but also feel that the Democrats could pick up 75 House seats from the Republicans if they play their cards right.