If it is a size matter, honestly, i too was worried at first which is what kept me from getting a retic a long time ago but if you get a SD/D from a reliable breeder and try to stick to a higher percentage SD blood with most or all the SD coming from mom, you should end up with a manageable snake for a single person.
Caesar is about 8 feet and easily manageable by me alone. He is kind of a lush though with his personality and if i get rather forceful with him, he will lay down and pout for lack of a better word. Not sure if other retics are like that but for Caesar it makes it easy to keep him in line. Now if i let him have his way, he goes all over from the top of the cage to the floor and all over lol.
Rosey my 7 foot boa is actually more of a handful than Caesar as far as weight and girth. Caesar is just longer and much more active. Honestly, i think you would like a retic. They are packed with personality. Like I've said before, Caesar and Harley my beardie are both there to greet me during the day. the boas looks at me but dont actually cruise over to me when i open a cage door and sit there looking at me and seeming to enjoy the interaction.
Oh just know also, owning a retic is not cheap lol. At least in my case. I go through full cage cleanings once a month and Caesar's food is a small fortune but he seems to be able to go about 2 weeks now and when i finally get chest freezer, food costs should drop. But retics piss and poop like a machine so i am always spot cleaning and like i said, i throw out the whole substrate once a month as it soaks up liquids.