Reading your post, you say that you are looking for “a seasoned companion” for your trek – So the first thing that you should be aware of is that a porter won’t usually walk with you, nor will he usually speak English – You will give him his load in the morning and meet him later in the day at a prearranged destination.
If you are looking for someone to walk with you and perhaps give you a little information and help on the trek then you would need a Porter/Guide – This is either a porter that has improved himself by learning to speak English (Not necessarily fluently) or a guide in training, he will carry around 15kg of your kit and also give you some information on the culture, language and customs of the area that you are trekking through, as well as guide you were/if necessary and help you negotiate a fair price at your lodge.
The next thing to mention is that hiring a porter or porter/guide at Lukla can be problematic as unless you arranged something in advance (Which is difficult to do from Lukla) then you would only be able to choose from who happened to be there at the time and subject to whatever price they demanded + Trekking Staff available at Lukla often don’t have any insurance,
Therefore I would Strongly recommend that you hire any trekking staff you require through a TAAN Registered Agent and if you wish, arrange to meet them at Lukla to save paying their airfare.
Trekking staff salaries when hire out thorough a reputable TAAN Registered agent should be around
A Licensed Guide will cost you around $30 per day
A less qualified Porter/Guide around $25 per day
A Porter around $20
The above rates should include their food, accommodation, insurance but not transportation or tip
Good Luck and Happy Safe Trekking
Rob
Travel Pages including Nepal blog https://web.archive.org/web/20150906143420/http://members.virtualtourist.com/m/50192/