Since you have a sub, bookshelf speakers rather than tower speakers may yield better sound quality in your indicated budget. Also, since you indicated local audio stores are unavailable a home audition from some of the better internet direct companies may be your best bet. These companies generally provide 30 day trials within which the speakers may be returned for full refund. Some of the companies even pay for part of the shipping.
Amoung these internet manufacturers are
www.axiomaudio.com, ascendacoustics.com, and av123.com. All of these companies have excellent bookshelf speakers in your range. If you provide more details such as the intended predominant use and room dimensions more detailed suggestions will be possible.
Good luck