I plan on asking for a new set of headphones for monitoring for Christmas and need advice on what kind to get.

·I'd say the budget is probably around $130.
·I'm going to be using them in a Toneport UX1 for now.
·I won't be using them just for recording guitar tracks, but creating tracks in various sequencers as well.

Hopefully someone can make a recommendation. I have been told to look into Sennheiser, but I was not told any specific model.
Also look at:

Sennheiser hd280.
They're cheap and an industry standard. Great for monitoring.

The HD 448's
Not as flat, but they add versatility as being great for recreational listening.

Sony MDR V6
Another industry standard, proven track record with these.