Let the Walmart mini-lab machine process the film and make "proof prints". then have any enlargments you want made at the profesional lab. ANYONE can develope negatives, no skill required buy not so with printing.
negatives are all you should care about keeping long term, if you want more out of your color photos, like poster size prints, or even 8x10 enlargements.
its better to get the film processed on the cheap end, and spend the money where it counts.
granted, maybe, a pro lab would give you better negs, but that can all be fixed in a darkroom, digital or a real Darkroom.
a good 1hr place would give you all your prints 4x6 (5x7 for a little more) plus a photoCD.
i use the photoCD to do quick things or for web portfolio, using the physical prints as reference.
but i scan the negative for Photoshop.
if i was to do enlargements, id create them digitally and have a pro lab use pro photo printers (like REAL photo printers on photographic paper) to create the physical print from a digital file.