I don't think Bradfield gets you even halfway there. Doyle has huge home/road splits, but historically that hasn't backed off the price of trying to acquire Colorado hitters all that much.
These were my first thoughts as well.
I don't mind him as a target, but the price is significantly more than Bradfield even with the home / road splits.
If Mullins isn't the CF next year, I'm pretty sure it will be Cowser.
If you try and find a cheaper CF, they are probably basically what Mullins already is.
If Cowser is in CF, and you want another LF... there would probably be obtainable options... albeit you have to factor in Waltimore, and have a LF that actually go and get it.