Stop feeling guilty.  There's no need to feel guilt.  Without wanting to sound flippant, but this isn't something to waste your time giving a second thought to.

If you are really uncomfortable with clients giving you gifts, either donate them to charity or tell your clients that you would rather they donate the cost of said gift to charity.

Some men believe that by being generous and bringing gifts, it will endear them further and they will receive better service. 

Out of curiosity, is there any mention of liking chocolates and flowers on your profile/website?  Do you have a wish list? If you have any of these things, I would remove them.  And if you don't state any of these things, I would make a point of mentioning that you do not welcome any gifts and politely request that clients take heed of this as refusal often offends.

One thing to bear in mind is that even an expensive gaming laptop may not have cost the client much, if anything. Lots of people get access to free stuff or heavy discounts via their work etc.

I know a way you can release your guilt, I send you my address and you can send them to me, this service is free of charge 

Like others say, if you feel guilty and can't get past your guilt, donate them to charity. I personally wouldn't feel guilty a jot, I think we do a demanding job that, though is by the hour well recompensed, is without holiday pay, sick pay, is precarious and sometimes even dangerous (like other jobs can be), is socially stigmatised and incorrectly thought of as easy. I work hard and I'm happy to enjoy whatever little pleasures or perks the job throws my way and I think you should too 

The only concern I have ever had when receiving more expensive presents is if they come with obligations down the line, a way of emotionally blackmailing me into letting them into my private life or something. Thus far, luckily that hasn't happened, but having said that I've only ever received a small handful of presents in the £200-£400 range, like most people I've mostly just got choccies, books, sometimes perfume, and the odd mid-range dinner (and a once a Wetherspoons breakfast! bless him).

I used to feel like this. I also used to feel that I owed them free time, out of hours contact etc etc.

I look at it this way now, when I give a gift what am I expecting in return and would I want the receiver to feel guilty or that they owed me and the answer is no. Perhaps they are trying to buy your affections but so long as your boundaries are clear and they know exactly where they stand it’s just a gift as any other and a token of appreciation for the difference you make to them.