I'm late answering this question but where on the Parkway would you like to be and do you travel north or south? You can find true lofts in Adams Morgan within your price range. Adams Morgan doesn't seem like easy access to the Parkway but if you take 18th St. to Calvert, you're right there. Adams Morgan has a distinct funky flavor that doesn't suit everyone but is certainly worth investigating.
There are many more options for you. I see the highest concentration of lofts in Adams Morgan and Logan (Church & 14th St.).
Get in touch if you'd like to chat. (301) 370-4499
I live near RCP and can appreciate the convenience! Are you looking for a 1 or 2 bedroom condo? Feel free to email me at Beaumont@LNF.com and I will send you available listings.