Pick a groupset you want first and stalk classifieds until you score a good deal on it or are able to score on the pieces.

If you start with a frame, you'll be on hold till you get the components. This will make you spend more money in the long run.

Components sitting on the shelf with no frame... Easy to take your time and be frugal.

Frame sitting naked in the corner... Hard to excersize patience and leads to comprimized parts or too much money spent.