Jrod -
I think it was I that set you on the elevation / altitude kick...so I apologize if it got you worried!
For the most part, as the others have noted, the north - south difference in Albuquerque metro itself is so miniscule it doesn't matter anything in terms of temps. Nada. Zero. It would be like "is it warmer in north Indy or south Indy?" It is the same.
Now, as for altitude, that does make a difference, and the others have given you excellent info. HOWEVER, I kind of know where you are coming from and what you are fearing, and you have nothing to worry about. Virtually anywhere you pick in the immediate realm of Albuquerque metro (as Tim Rankin noted), you'll have roughly the same good weather.
So Rio Rancho isn't much different than the Four Hills which isn't much different from the Northeast Heights, etc., temps-wise.
Rio Rancho is fine for temps. It is in the northern area of the immediate ABQ metro, however, it isn't significantly higher in altitude than the rest of ABQ so the temps aren't much different.
The others have pointed out that the Valley tends to be the hottest (in the summer) and the coldest (in the winter), but that should be possibly clarified a bit...overall, year-round, the Valley always has slightly the highest daytime highs, but always the coldest nighttime lows. Generally this applies to the summer as well as the winter. Thus, in the summer, if it is 98 in the NE Heights, it'll be 102 in the North Valley for highs. Then at night, if it is 74 in the Heights for the low, it'll be 71 in the Valley (just examples).
Transversely, in the winter, if a low drops to 25 in the Heights (from, say a high of 51), it could drop to 20 in the Valley (from, say a high of 53).
I kind of think the ideal ABQ weather is in the NE Heights, and to be even more anal, the Uptown area. I was big on growing some palm trees and fruit trees in my back yard, and the warmer overnight lows in the Heights helped significantly with that kind of gardening type of stuff.
However, frankly, unless you care about gardening type stuff, the only consideration you really would have (again, I am pretty sure I know where you are coming from based on your posts) would be this:
Stay WEST of Tramway Blvd. (as ABQSunseeker pointed out - she would be east of Tramway), and, ideally, probably west of Juan Tabo too. East of Tramway is the foothills of the Sandias and 6000+ altitude where the weather is drastically different than the rest of the (vast majority) of the city temps-wise. Once you get to Juan Tabo, it is what, approximately probably a mile heading east to Tramway, and in that stretch the altitude really climbs. Not nearly as drastic a difference from the rest of the city between Juan Tabo and Tramway as it is Tramway east, but still sometimes a number of degrees.
The "main" north-south streets on the farthest eastern portion of the city (up to the foothills of the Sandia Mountains and the high altitude area of the city), starting at the far east, are Tramway Blvd., then Juan Tabo, then Eubank Blvd. Once you hit Eubank and head through the vast majority of the city heading west, you've entered the "banana zone" of the city (the warmest temps) and that lasts quite a bit until you get way to the far western edges (West Mesa area, etc.).
Again, realize that my "stay away" scenario is a small sliver of the city on its far east side. The rest of the city / metro falls into a fair bit of a "wash" category.
So really, if you'd chose Four Hills, Rio Rancho, the NE Heights, etc., you'll be fine for your temps / weather. They are all pretty much a wash over the course of a year roughly speaking.
Where altitude concerns really come into play for newcomers looking for warm weather as Tim Rankin pointed out would be if you leave the sunbowl/warm-bowl of the immediate ABQ metro area (heading north, east, or west) heading into the real high country (altitudes of 6000 and up). If you stick to the ABQ metro immediate area or heading south, you'll be in the warm spots.