Well Studio and Liquid are two completely different beasts with regard the useability and interface. However, I would agree with Mihai in that it sounds like you would definitely benefit from upgrading to Liquid 7. Here are the reasons imho:
- You do a lot of sound integration - AL 7 comes with Smartsound built in, the number of packs available now from Smartsound is superb and the quality nowadays are so professional (I have the Film Composer volumes which are superb)
- Transistions and effects - Liquid comes with over a 1000 transititions and effects and these include those from Hollywood FX Pro as well as all the excellent ones Pinnacle's (now discontinued ) compositing program Commotion had.
- DVD authoring is built into Liquid, and although Premiere Pro 2 now has this too, it's very much more lightweight then Liquids from my experience with it. (It's where Liquid was a couple of versions ago)
- It's cheaper. You will get a favourable upgrade to a product which is already cheaper and comes with Smartsound integrated. I don't believe Adobe do competitive upgrades to Premiere Pro and it's base price is higher (and you need to purchase Quicktracks from Smartsound if you want the Smartsound integration)
Of course, it's way more stable and better performing than 9.1. It's one of the best and most capable editors out there on the market anywhere.
good luck with your choice.