I feel like i should post my credentials before saying more, so fyi, i am a last semester Masters student in Music Composition with an electronic emphasis. I also do IDM in my spare time.
Reason 3.0 is pretty decent for what Reason does. The synth sounds, the sampler, hell even Redrum works fairly well. The key to make Reason sound like something other than Reason is to tweak the settings. It is amazing how much of a difference just a few tweaks here and there can make. The main complaint of those that say "Reason sounds like Reason" is the drums. The stock stuff is pretty drab, so what is stopping you from making your own samples and using Reason to play them back as you like? Or just tweak the drum sounds a bit and it helps to some degree.
Is Reason the be all, end all program? Absolutely not, as said before Reason does not deal with acoustic audio well, but hey, thats why you have Logic, Pro Tools, Cubase, etc.
Do i have any Reason audio to back up my claim? No. Why? Because with a vintage Moog Modular Synth, 2 ARP 2600's, a Prophet 600, a Aries 300 and Max/MSP i have no need for Reason.
Reason works well for "pop" musics, and the like. The problems come in when Joe Blow picks up Reason, makes a song using default settings and thinks he is the next Aphex Twin. Sorry, it dosent work that way. A critical ear can easily discern the difference b/t the sound of Reason and lets say Reaktor.
I have a friend that swears by Reason for his DnB stuff and he gets decent results. To each his own. And to the other posters, those that love Reason and those who hate it, no flames are intended either way. My personal choice is to build whatever i need in Max/MSP. For what i do, it gives me the best results and total control.
Back on topic, to the OP, what exactly do you want to do with Reason? What do you want the software to do, and what are your needs? That is the only real way we can actually attempt to give some decent advice to you as to what programs would be suitable.
Edit: [extended rant] By the way, the software does not make the music, it is what you make with the software that makes the music. Squeezing all you can out of a software program or piece of hardware is at the heart of music and musical exploration. Want a sample of this? Check out
this. Done using Reason, and Peak (only to normalize and convert the file to .mov). It took me about 60 mins. It may not be pop, but it sure as hell shows the flexibility of a program once you dig into it.[/extended rant]