I recently rode with a women from off the mountain and she had a rpm computer...she said it helped improve her speed. I asked my local LBS about it and they said it's silly to have one here in the mountains. They said don't bother with it. I'm happy to agree with them because the last thing I want is to spend more money on my bike...especially on something so computer/tech related...I'm not into the whole gear thing. I just want what I need, no excess.

So, I was thinking a Heart Rate Monitor would be more appropriate. I want to make sure I am properly training and challenging myself.

Any recommendations on a HRM? I want something basic and inexpensive...I'm not a very technical person and don't want my cycling to get complicated...I just want to make sure I'm reaching peak performance.