A question of bass... Several actually.

You can only get so much bass from a 6.5" driver. After a point design makes the bass peaky and boomy on smaller drivers. Initially it gives the impression of more bass but as Jax2 pointed out it becomes one note boom. Move to a floor stander with a larger woofer for deeper bass ($$$)or a sealed box sub for responsive low bass. I would also recommend good solid state amps to dredge max bass from speakers though I prefer the sweet midrange of tubes.
A sub & monitor speaker combo will allow solid state bass with tube midrange and the stellar imaging of a monitor speaker.

I integrate an ACI Titan II with ACI Jaguar 2000's for a very nice full range. The signal to the Jaguar's cuts off at 85hZ thanks to in line filters and the Titan is quick and tuneful. Admittedly intergration can take some time fiddling but once it is there you are good as long as you don't make big changes in room arrangement or gear. - MHO

Rhanechak - what amp did you have driving the Dynaudios? My experience is that the A 72's can go very low and loud when driven with sufficient power (300W or more into 4 ohms). The Regas on the other hand are more efficient and can run on less juice - like that produced by a Rega amp...

Bass reproduction is a two-way equation, power to control vigorous driver movement and a combination of driver diameter and throw to move a lot of air. The smaller the driver, the faster and further it has to move to displace the same amount of air as the larger diameter driver. I have heard phenomenal bass from stand mount monitors when driven with lots of clean power. They weren't hitting impossibly low notes, but the notes they were hitting were controlled, clear and loud.

So, I might say that while it is not "necessary to spend $1000 per speaker or over to have audible, palpable, appropriate bass reproduction" it may be necessary to spend $1000 per channel of amplification to get it.

Subwoofers are an entirely different story, and the trick there is that most better ones come with their own capable bass amplifier designed to control the woofer. The idea provided above to split the signal after the preamp and drive a high quality monitor with a high quality but lower wattage tube or SS amp, letting the sub fend for itself is a good one. Sub speaker integration is usually possible, but takes some fiddling, and may actually require trying several subs with your system to find the best match.

With either the Rega or the Dynaudios, you should not need a sub unless you need the walls of your house and your heart to move with the music. As long as you feed either pair with adequate power (which would be more in the case of the 72's), they should reward you with nearly full range sound.

Good luck.

I was using a Prima Luna Prologue 1, the amp I was thinking of buying. Why not audition all the components I wanted to put together?
After having read the reviews of the Dynaudio 72's (many many many positive), and the Rega R3's (very few, although positive), I was really unimpressed by the Dynaudios.
Their presentation was flat and unimpressive.
The Regas presented a great image, and seemed more 'live.'
The bass in both speakers seemed adequate.

Would 100 wpc solid state do the trick for the Dynaudios?