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Reviewing our pricing plans, I recommend you use the Silver plan. This plan will enable you to have 10000 submission per month and have 100GB of storage plan. This is by far what you indicated needed.
You may also view our BRONZE plan. This will cover your needs for storage (10GB), but you might have some issue of the number of submission. This plan enables you to submit 1000 per month. If I understand you correctly you will be requiring about 20000 for a year. This plan will give at most 12000 a year, leaving you short.
Please let us know if you require further assistance.