I got hold of a second-hand Behringer V-amp pro (same as the V-Amp models but is rack-sized and has a couple of extra outputs). It's good and very versatile and I forget what I paid, but it was cheap on eBay. Maybe ?70?
You can use a wide variety of fx together, but you are limited to the combinations allowed by the unit (maybe you can get under the bonnet and cook up your own, but I haven't worked out how). Using your example, reverb is an effect all on it's own and can be put on top of any of the other effect combinations.
Stomp boxes are a great way to get exactly what you want although two or three could easily cost the same as I paid for the Behringer .......
Why do you ask? Do you particularly like the idea of rack-mounted kit?