More valueable? Easy...highly detailed figures (customized, painted, decals, customized, face masks, etc.). Its not even close to me. Not stock Miggle teams painted like my kids would do but some of the amazing customized stuff you see on this chat board. I feel I can get a good base in a matter of a few minutes, and a great base comes more often with a little luck than pure perceverence. Thats why if you have boat loads of bases like I do (and like many of you) your best percentage of getting great bases is to tweak up a bunch and expereiment with them. Am I short changing "great" bases compared to "good" bases? From what I've seen I really don't think so. There's no short cut to detailing these little figures and its very tedious work. If my house was on fire I'd probably go back in after the figures, not sure if I would risk it for the bases.
Now the field...a really good running big custom field...that may be the number one item you put on your christmas list to truely enjoy the hobby. I love a good running field!