Yeah, the Alivio stuff isn't bad, I've actually got an Alivio rear derailleur on my bike. It does get the job done, though it probably won't last as long as the Deore group.
If you have a drop-bar road bike, the shifters are considerably more expensive. I ended up getting downtube shifters because they were so much cheaper than the integrated brifters (and I needed long-pull brakes anyway).
I guess I should say, if you get the baseline road group, external bottom bracket, brifters, etc. it will run multiple hundreds of dollars. There's always cheaper ways to do it.
Also, there are cheaper IGH options, too. Sturmey Archer makes an 8-speed hub for less than $200, I've seen them for as little as $160, with shifter. There are always cheaper options. Apples to oranges, the price difference still isn't that great.