If they aren't A/V nuts think the main feature diffences between models that's going to interest them will be:
- Load times - it can get frustrating waiting for a BD disk to load up.
- Brand/model reliability
- Possibly features like Netflix streaming.
I'm pretty happy with the LG BD370 (<$200) I put in my bedroom because it has speedy (for BD) load times and does Netflix streaming. The BD390 (~$250) would be a step up in installation convenience because it does 802.11n wireless.
Quickly17, hope you don't mind a new guy sticking his nose in here... my kids bought me the Sony 360 for Christmas and I can find no fault with either audio or video performance of the unit's play-back of CDs or DVDs. I do find it to have fairly long load times but I have nothing to gauge that against other than our previous DVD player. When operating the DVD player connected directly to the TV (Sony Bravia 1080P 42") via HDMI, or with audio routed to receiver (Marantz SR7000) via Toslink (optical.. using the player's DAC) seem perfectly fine. I haven't tried it yet using analogue feed and the receiver's DAC. Up-converting of standard DVDs is good.. considerably enhanced from the previous non-Blu-ray player.
Is it good value for $150? So far, I'm not disappointed. That isn't to say that an avid a/v-phile (new term?) mightent expect and more stringently test more of it's features, holding it to a higher standard, but for this $ what's not to like?
An additional factor that you might consider is the complexity of operating the different units you are considering. Personally, I prefer using devices that are intuitive, simple and straight forward and don't require a lot of fussing around to perform necessary routine functions. ..cabling, set-up, navigation, integration with other components, layout and functions of remote control and so forth.
Suggest you sit down with your parents, make out a list of which features they would like and use, and then match that list to your options.
That's my .02 cents FWIW.