First of all make sure you get at least a Plossl type EP. My suggestions concernig what size EP`s to use are a 26/25mm and a 18/17mm and a 2x Shorty Barlow. Then you`ll have 4 eyepieces. Example: A 26mm & 17mm with Barlow will give you a 13mm & a 8.5mm. This is about the max you should go. With a 4.5" at a focal length of f/8 to f/10 your maximum mag. power shouldn`t exceed 200x for a 114mm (4.5). I only recommend smaller focal length EP`s to refractor owners who`s aperture size is 3.5" or larger. Buying a 10mm, or a 5mm on the scope you have would be a waste of money. As for brands; Orion has Plossls that are affordable, they also have their Sirius names. I perfer Celestron EP`s overall, but they have changed vendors so I don`t know if the quality has been compromised. There is Apogee where you can get cheap EP`s but I don`t know of the quality of them. Go to Orion (www.telescopes.com) and order their free catalog. Shop around for EP`s. But....make sure it is a Plossl or better. Stay away from Kellner types. And if you order a 2x Barlow, make it a shorty type. Good Luck!!