My chasing coverage area and thoughts..
I don't personally like overnight chases.. If I took a chase-cation type thing I probably would be fine with it, but since I live in the heart of the alley and have plenty of action near me I generally just chase one-day ventures when my regular schedule permits.
So with my home base of Manhattan, KS I generally chase the following:
All of Kansas: Don't like the red hills of Barber, Comanche, and Clark counties or flint hills ( roughly 40 miles either side of a Manhattan to Osage Co. OK line), lack of road options and hilly. Favorite areas are South central, West central, South west KS. Personally I think The area of Sumner, Harper, Sedgwick, Harvey, McPherson, Rice, Reno, Kingman, Stafford, Pratt, Barton, Kiowa, and Edwards counties is some of the best chasing territory in the plains (great roads, completely flat, few trees, lots of supercells). For those who don't know KS counties this roughly bounded by Greensburg to Great Bend to Newton to Wellington to Pratt line. Central and North central KS are good too but it is a little hillier north of about K-4
Western Oklahoma and the Texas panhandle: Although Manhattan, KS to Childress, TX is about a 7 hour drive I don't mind heading pretty far southwest when the storms will carry me back towards where I came from. Obviously there are weak areas but by and large good chase country, especially considering the large amount of great supercells the area gets. Will absolutely not go east of 35 in OK, however east of 35 in KS is not bad except flint hills, despite what some have said. Areas I don't like in W OK/ TX Panhandle include red hills of far NW Ok, Canadian river valley and other scattered canyons in TX, Wichita mountains.
Far Eastern Colorado: I generally won't go west of the first couple row of counties as far as a original target is concerned. In other words I'm not gonna go after a purely upslope event, but I will target a dryline in eastern colorado (Say an event like May 9th 2015). Great terrain, but questionable road networks.
South central/South east (Sometimes all of Eastern Neb): I love chasing south central and at times SE Nebraska, great chase country in all aspects ESP. SC Nebraska and not far from home. I don't usually like going too far north past say Columbus, NE just because storm motions will usually lead me further from home but in the case of high end events I wont hesitate to chase all of eastern Nebraska. I will not chase the sand hills or anything else NW of North Platte. Not worth the drive given the road network. I have occasionally chased SW Nebraska.
Other Notes...
I don't like chasing Missouri, hills trees get worse and storm motions take me far from home (seams like every time I chase there storms are moving NE @ 45+mph), but I will go into western mo if I target eastern KS and storms move into MO.
I have heard great things about Eastern SD and would like to try up there some time but it will take a really high end event and not having any obligations the next day to get me up there.
Definitely do not see myself ever venturing to Dixie Alley.. not even that little stretch of Eastern Arkansas where its flat and treeless, I've seen enough videos of messy HP hard to keep up with tornadoes on you tube from down there and that will do just fine.
I am always much more satisfied by a 25mph LP non-tornadic structured supercell than I am a 45mph fat-hook HP with a rain wrapped wedge behind something that looks more like a shelf cloud than a wall cloud.. that you might catch a low contrast glimpse of as it blows by your only road you have, never to catch up with it again.. so hey maybe I should rethink my not chasing CO upslope huh haha.
So in closing basssically all of KS, W OK, TX PANHDL, far E CO, SW, SC, E Nebraska.