That's a pretty tough question that only you can probably answer by acutally looking at one of those campers in person. We have the 1030 and from what I've been told it's similar to the 1055. I would much rather have a slide for the extra room but we got this one for $4000 from a one owner little old lady. No kidding, she was 65 when she bought it new.
If I could spend $15k or more on a used one I'd have a slide. Of course I'd also have to buy a one ton truck first. With the 1030 I'm 2000lbs over GVRW and just 500lbs under the rear tires rating.