In that case, I would like to encourage you to start out buying a pair of the UB5's and a pair of Sony CS5's from Amazon (who has 30 day return policy). We all have different preferences, but to my ear, the Sony is a better speaker despite being half the price of the UB5! Currently Andrew Jones is the big fad and the pro reviews are hyping the heck out of his designs.
I'm not saying his designs are bad - when he did the Pioneers, they took the prize for best speaker in their price class, IMHO. Sony (a direct BestBuy competitor to Pioneer) responded by putting some design talent in the Core Series which (aside from the Philharmonic AA's which add exceptional bass) is the best ~$200 speaker, to my ear. I'm not a fan of Sony, their products are generally overpriced, but the CS5 is a great exception!
Understand that I don't want you to trust me and just buy the Sony...your preferences may be different from mine. I am simply suggesting you do a no-risk listening comparison and see what you think.
If you are interested in doing this comparison and want, I can dig out my notes and tell you some specifics (sounds and songs) that led me to my conclusions about the Sony vs the Elac.
https://www.amazon.com/Sony-SSCS5-3-Driver-Bookshelf-Speaker/dp/B00O8YLMVA/ref=sr_1_1?s=aht&ie=UTF8&qid=1482335712&sr=1-1&keywords=sony+CS5
https://www.amazon.com/ELAC-Uni-fi-Bookshelf-Speaker-Black/dp/B01CRYWVG2/ref=sr_1_1?s=aht&ie=UTF8&qid=1482335765&sr=1-1&keywords=elac+ub5
PS - The UB5 is not a bad $500 speaker, but the Sony is a great $200 speaker (IMHO, YMMV). The Philharmonic AA's are an even better deal than the Sony's (although that is debatable when the Sony is at $169), but I cannot ask you to risk the cost of return shipping.
For anyone not using a sub, the AA's would be a no-brainer (IMHO) and I would suggest they compare the Sony vs UB5. If they prefer the Sony, return them and get the AA's which sound similar to the Sony in the mids and highs, but add exceptionally clean and deep bass. However, since you will have a sub, that deep bass is not so important and the AA's are a larger and heavier speaker which (depending on how you intend to mount them) may make for a more difficult surround installation.