Q Acoustics are better speakers over the smaller DX2s which few members have commented sounding little strained when being pushed to higher volumes. You can´t expect too much from small sealed cabs with tiny 3" drivers so more ideal for smaller rooms at moderate volumes, but they look quite nice on-wall and are easy to wall mount flush against wall with few screws. QAs are more bulky (deep) but also are more of real upgrade from the small Jamos. You do need the metal wall brackets or something like B-Tech Ultragrip BT77 Ultragrip Pro from Amazon.
Here is pictures of 3020 on the top of av-unit and 3010 wall mounted as front heights (atmos). I think the new 3010i is closer the size of 3020 which makes the 3000i bit more intresting as whole. Also the newer 3000i serie finishes are much nicer esp. white and walnut! Click the pictures on this post to see the size:
I also think the 3010/3020 would sound better than the 2010i/2020I and concept 20 because of the difference of the tweeter, i don't think a 12kg cabinet "concept20" would make a difference to the about 6 kg the 2020i has, why the 3020 is lighter than the 2020i i have no idea why
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One negative thing is the rather poor subwoofers in these packages. I wonder how much they would ask if you could swap the slim 3060S to QB12. There is only 100£ difference between these two subs if bought alone. I can promise you there will be very noticeable difference going from such slim design 8" (3060S) to more powerfull larger 12" sealed (QB12) model. Also at this point the upgrade would be cheaper to do than later. It would also be your next upgrade if we think about what is the lagging part of your system. So think carefully and talk with the RS shop manager if he can make you superb deal by swapping the sub.
Shop for Q Acoustics Q B12 Black Subwoofer with Richer Sounds for expert advice and lowest prices guaranteed
www.richersounds.com
Another option is to buy 3010 (2pairs) and 3090C as 5.0 package for 300£. Then buy sub from BK which builds their subs in UK and sells direct to customer without middleman. To keep close to your budget the tall but narrow (28cm) dual 10" driver
BK Double Gem would be great alternative found in the site below as new grade-b in few different finishes:
Main site information and pictures:
Before you ask there is no requirement to match subwoofer with speakers (same brand)! Attachment has picture of full white Double Gem in room.