Step 1- read the 'question' from the person looking for advice.
Step 2- did you read ALL of the words? Seriously, go back and make sure you didn't get hung-up on one specific word like: Powder or Ice or High Speed. There were other 'bits', did you pay attention?
Step 3- Who is the OP? A guy? adjust ability down. A girl? Leave ability alone or adjust up slightly.
Step 4- What type of jargon is the OP using? Adjust for ability like this: 'Double diamond'- down, High Speed- down, no-fall-super-duper-gnar- way, way down, 'I used to race'- down, 'back in the day'-down, etc.
Step 5 - remove yourself from the equation. The OP is looking for advice for gear she/he wants to use for the type of use she/he wants to use it for. You don't matter. At all.
Step 6- where is the OP located and where does the OP actually spend their time skiing?
Step 7- Do you have any 'real-world' experience that will help? Yes? Cool, post it. No? Sit back and let others post first, odds are you'll get a chance to post something dumb a little later in the thread.
Step 8- Keep it SIMPLE. Most people asking for advice on the internet (or in a ski shop/ car dealership/ bike shop) want some help to understand what it is they are looking for and what it is that will allow them to go do something. They don't want to be bombarded with technical specifications or argue semantics. They want a tool to help with a task, not to pass a vocabulary test. If they want specific details they WILL ask.
Here's the deal- 9 out of 10 people who are looking for new skis aren't looking for a complete specialty ski... if they are they usually stress that. So preaching that "a crud ski isn't a powder ski, they have different qualities", while true in many respects, is not helpful when the OP is looking to complement an RX8 and asks for a ski "for trees, powder, crud and cut-up... that can handle bumps and ice... at Watchusett". Sure for powder in trees in a vacuum the newest whiz-bang reverse sidecut rockered wonder ski would be better than a Watea 94... that's not helpful to a fellow who wants to ski mixed snow conditions, in New England, on something other than a race carver. chances are that fellow wants something he can use more than 3 days a season. A 'compromise ski' may be in order.